Zte Blade V10, User Manual

Page 1: ...ZTE Blade V10 User Manual ...

Page 2: ...oration reserves the right to make modifications on print errors or update specifications in this guide without prior notice This manual has been designed with the utmost care to ensure the accuracy of its content However all statements information and recommendations contained therein do not constitute a warranty of any kind either expressed or implied Please refer to For Your Safety to be sure t...

Page 3: ...oid is a trademark of Google LLC The Bluetooth word mark and logos are registered trademarks owned by the Bluetooth SIG Inc and any use of such marks by ZTE Corporation is under license microSDXC Logo is a trademark of SD 3C LLC For DTS patents see http patents dts com Manufactured under license from DTS Licensing Limited DTS the Symbol DTS and the Symbol together are registered trademarks or trad...

Page 4: ...e operation of the product CAUTION Safety information that if ignored may cause minor damage to the equipment or service interruption WARNING Safety information that if ignored may cause serious damage to the equipment or danger to personal safety Version No R1 1 Edition Time January 3 2019 ...

Page 5: ...6 Locking Unlocking the Screen and Keys 16 Using the Touch Screen 17 Extending Home Screen Panels 18 Choosing Your Wallpaper 18 Removing Items from Your Home Screen 19 Personalizing 20 Changing the System Language 20 Setting the Date and Time 20 Turning System Sounds On Off 21 Using Do not Disturb Mode 21 Protecting Your Phone With Screen Locks 23 Protecting Your Phone With Screen Pinning 24 Using...

Page 6: ...ect 38 USB On The Go OTG 39 Sharing Your Mobile Data Connection 39 Connecting to Virtual Private Networks 42 Phone Calls 43 Placing Calls 43 Answering or Rejecting Calls 44 Checking Voicemail 45 Using Options During a Call 45 Managing Multi party Calls 46 Adjusting Your Call Settings 47 Contacts 49 Adding a New Contact 49 Searching for a Contact 49 Editing Contacts 50 Messages 51 Opening the Messa...

Page 7: ...53 Downloading Files 54 Changing Browser Settings 54 Camera 55 Capturing a Photo 55 Recording Videos 57 Using Other Camera Modes 58 More Apps and Features 60 Music 60 Clock 60 File Manager 61 Voice Recorder 62 Google Apps 62 Settings 64 Mobile Networks 64 Sound 65 Location 66 Accounts 66 Languages Input 66 Reset 67 ...

Page 8: ...date 67 For Your Safety 68 General Safety 68 FCC RF Exposure Information SAR 71 FCC Regulations 73 Distractions 74 Product Handling 74 Electrical Safety 79 Radio Frequency Interference 80 Explosive Environments 81 ...

Page 9: ...tting Started Getting to Know Your Phone Charging USB Type C jack Main microphone Front camera Touch screen Earpiece Indicator light Speaker Volume key Power key Proximity light sensor Auxiliary microphone ...

Page 10: ...9 Headset jack Flash Dual lens Back camera Fingerprint sensor nano SIM microSDXC card tray ...

Page 11: ...home screen from the Home key to view the recently used apps Swipe up the screen from the Home key again to view all the apps Back key Touch to go to the previous screen Installing the nano SIM Card and microSDXC Card Optional The nano SIM card can be installed or removed while the phone is turned on WARNING To avoid damage to the phone do not use any other kind of SIM cards or any non standard na...

Page 12: ...Insert the tip of the tray eject tool into the hole on the card tray 2 Pull out the card tray and place the nano SIM card and the microSDXC card on the tray as shown Carefully slide the tray back into place ...

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Page 14: ...USB cables The use of unapproved accessories could damage your phone or cause the battery to explode WARNING Use only ZTE approved chargers and USB Type C cables The use of unapproved accessories could damage your phone or cause the battery to explode NOTE Use the charger that comes in box with your phone to charge the battery WARNING Do not remove the back cover The battery is not removable Remov...

Page 15: ...14 1 Connect the charger to a standard AC power outlet If the phone is on you ll see a charging icon such as or appear on the Status Bar 2 Disconnect the charger when the battery is fully charged ...

Page 16: ... holding the Power key for about 10 seconds to restart the phone Powering You Phone On Off Press and hold the Power key to power on your phone To power off press and hold the Power key and touch Power off Setting Up for the First Time When you first power on your phone after you purchase it or reset it to factory settings you need to do some settings before using it Touch the language field to sel...

Page 17: ...ou to quickly lock the screen and keys put the phone to sleep mode when not in use and to turn the screen back on and unlock it when you need it Locking the Screen and Keys To quickly turn the screen off and lock the keys press the Power key NOTE To save battery power the phone automatically turns off the screen after a period of time of inactivity You will still be able to receive messages and ca...

Page 18: ...s the onscreen buttons simply touch them with your finger Touch and Hold To view the available options for an item for example a message or a link in a web page touch and hold the item Swipe or Slide To swipe or slide means to quickly drag your finger vertically or horizontally across the screen Drag To drag press and hold your finger with some pressure before you start to move your finger While d...

Page 19: ...home screen is extendable providing more space for shortcuts widgets and more Simply swipe left or right on the home screen to see the extended panels You can add or remove home screen panels or adjust their order To add a new home screen panel 1 Touch and hold an empty area of the home screen 2 Slide the home screen thumbnails left and touch Choosing Your Wallpaper You can set the wallpaper for t...

Page 20: ...t the WALLPAPERS tab Then select a built in image or an image from your gallery Removing Items from Your Home Screen 1 Touch and hold the item you want to delete 2 Drag it to Remove to delete it 3 If the item is an application touch OK to uninstall it NOTE Some preinstalled apps cannot be uninstalled ...

Page 21: ...en twice from the Home key to view all the apps and touch Settings System Date time 2 Set the date time time zone and time format To adjust the date and time automatically touch to select Use network provided time or Use GPS provided time To adjust the date and time manually touch and turn off Automatic date time and touch Set date Set time to change the date and time To adjust the time zone autom...

Page 22: ... limit interruptions with Do not disturb mode This mode silences your phone so that it doesn t make sounds or vibrate when you don t want it to 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings Sound Do Not Disturb 2 Set the following options Behavior Sound vibration Select which types of notifications will be permitted when Do not disturb is enabled Notifi...

Page 23: ...dule Duration Configure the duration of Do not disturb mode You can select one option from Until you turn off For 1 hour default duration can be customized and Ask every time Turn on automatically Configure the rules for turning on Do not disturb mode automatically You can configure the rules for Sleeping and Event or add a new rule by touching Add rule Sleeping Select the Days Start time and End ...

Page 24: ...e to open Quick Settings and then touch Do not disturb to quickly turn on or off Do not disturb mode Protecting Your Phone With Screen Locks You can protect your phone by creating a screen lock When enabled you need to swipe up from screen and then draw a pattern or enter a numeric PIN or a password to unlock the phone s screen and keys 1 Swipe up the home screen twice from the Home key to view al...

Page 25: ...o upgrade the phone software to use the phone Protecting Your Phone With Screen Pinning You can use the screen pinning feature to keep an app in view so others cannot switch to other apps or access your personal information Turning On Screen Pinning 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings Security location Advanced Screen pinning 2 Touch the On Of...

Page 26: ...reen and return to normal use touch and hold the Back key and Home key at the same time If you have turned on Ask for unlock pattern PIN password before unpinning draw the pattern or enter the PIN or password to unlock the phone Using Your Fingerprint Register a Fingerprint 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings Security Location Fingerprint Fing...

Page 27: ...tered NOTE Touch an existing fingerprint record to change its name or delete it Set Fingerprint Actions 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings Security Location Fingerprint Fingerprint management 2 Enter the screen lock pattern PIN or password you set 3 You can set the following options Wake up and unlock your phone When the screen lock Pattern P...

Page 28: ...acial Recognition You can use face recognition to unlock the screen or open the locked apps in Private Space NOTE The security strength of face recognition is lower than that of password pattern and fingerprint Create a Face 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings Security Location Face Verify 2 Set one screen lock method Pattern PIN Password NOTE...

Page 29: ...n the screen display if the screen is off 2 Put your face in front of the screen If the face recognition fails touch to try again Set Facial Recognition You can set how face recognition works 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings Security Location Face Verify 2 Enter the screen lock pattern PIN or password you set 3 You can set the following opt...

Page 30: ...n use face recognition to open the locked apps in Private Space Bright display If this option is enabled the phone will increase screen brightness automatically to verify your face easier when in a dim light Delete face data Erase the existing face data ...

Page 31: ... USB tethering on Missed call Call in progress Call on hold Airplane mode New message s New message s from the Gmail app Location service on microSDXC card mounted Connected to a Wi Fi network New Wi Fi network detected Mobile hotspot on Mobile data in use Microphone off Battery full Battery low Battery charging Vibration on Music playing Speaker on ...

Page 32: ... the notification panel swipe your finger down from the top of the screen To close the notification panel swipe your finger up on the screen or touch the Back key Responding to or Removing a Notification In the notification panel you can respond to a notification or remove the notifications The notification panel also supports expandable notifications that let you perform additional actions right ...

Page 33: ...tification panel and drag the panel downwards to find the following Quick Settings on the screen Wi Fi Touch to turn on or off Wi Fi Touch and hold to open the Wi Fi menu in Settings Bluetooth Touch to turn on or off Bluetooth Touch and hold to open the Bluetooth menu in Settings Ring Vibrate Silent Touch to select sound mode Flashlight Turn the flashlight on or off For your safety do not look dir...

Page 34: ...Z POP soft key Back key in default Drag and release the soft key to show other keys Lock screen key Home key Recent app key and Screenshot key VideoScreen Touch to use the VideoScreen function When on you can record the screen activities as a video Do not disturb Touch to turn on or off Do not disturb mode Touch and hold to open the Do Not Disturb menu in Settings Sync Touch to turn on or off auto...

Page 35: ...eaking with the Google voice typing feature Enabling or Disabling Input Methods 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings System Languages input Virtual keyboard Manage keyboards 2 Slide the switches beside the input methods to enable or disable them NOTE Some default input methods may not be able to be disabled Managing Input Method Settings 1 Swip...

Page 36: ... disable mobile data use To get data services when roaming 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings Network Internet Mobile network 2 Slide the Roaming switch to enable or disable roaming NOTE Data roaming may incur significant roaming charges Setting Access Point Names To connect to the Internet you can use the default Access Point Names APN And i...

Page 37: ... networking technology that can provide Internet access at distances of up to 300 feet depending on the Wi Fi router and your surroundings Turning Wi Fi On and Connecting to a Wi Fi Network 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings Network Internet Wi Fi 2 Slide the Wi Fi switch to turn it on 3 Touch a network name to connect to it 4 If the network ...

Page 38: ...d network 4 Enter the network SSID name If necessary enter security or other network configuration details 5 Touch SAVE Connecting to Bluetooth Devices Bluetooth is a short range wireless communication technology Phones or other devices with Bluetooth capabilities can exchange information wirelessly within a distance of about 30 feet The Bluetooth devices must be paired before the communication is...

Page 39: ...me password is entered Wi Fi Direct Wi Fi Direct allows Wi Fi devices to share files and data directly by connecting to each other without the need for wireless access points hotspots To connect to another device via Wi Fi Direct 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings Network Internet Wi Fi 2 Slide up on the screen and touch Wi Fi preferences Adv...

Page 40: ...USB flash drive you can browse the files on the flash drive connect the phone with a USB mouse and you can navigate the phone with the mouse Sharing Your Mobile Data Connection You can share your phone s data capabilities through tethering or by activating the mobile hotspot feature to create a Wi Fi hotspot Sharing Your Mobile Data Connection via USB You can access the Internet on your computer v...

Page 41: ...cable Sharing Your Mobile Data Connection via Bluetooth If your computer can obtain an Internet connection via Bluetooth you can configure your phone to share its mobile data connection with your computer 1 Pair your phone with your computer via Bluetooth 2 Configure your computer to obtain its network connection via Bluetooth For more information refer to your computer s documents 4 Swipe up the ...

Page 42: ...e is enabled you cannot use your phone s Wi Fi capability to access the Internet You still remain connected to the Internet via your mobile data network 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings Network Internet Wi Fi hotspot 2 Slide the switch to the On position 3 After a moment the phone starts broadcasting its Wi Fi network name SSID 4 On another...

Page 43: ...your login credentials or install security certificates before you can connect to your VPN You can get this information from your network administrator To add a VPN 1 Swipe up the home screen twice from the Home key to view all the apps and touch Settings Network Internet Advanced VPN 2 Touch to add a new VPN 3 Enter the VPN name server address and other information provided by your network admini...

Page 44: ...ch to open the dialpad 3 Enter the phone number with the dialpad Touch to delete incorrect digits 4 Touch below the keypad to dial NOTE To make an international call touch and hold the 0 key to enter the plus symbol Next enter the country code followed by the city area code and then the phone number Placing a Call From the Call History 1 From the home screen touch Call history If the dialpad is vi...

Page 45: ...side a contact to place a call Answering or Rejecting Calls When you receive a phone call the incoming call screen opens displaying the caller ID or the information about the caller that you ve entered in the Contacts app You can answer or reject the call Answering a Call When you receive a phone call slide up to answer NOTE To silence the ringer before answering the call you can press the Volume ...

Page 46: ... password 4 Follow the voice prompts to listen to and manage your voicemail messages Using Options During a Call During a call you will see a number of onscreen options Touch an option to select it Touch to mute or unmute your microphone Touch to open the Contacts app Touch to turn the speakerphone on or off Touch to make another call separately from the first call which is put on hold Touch to op...

Page 47: ...nd may result in additional charges Please contact your service provider for more information Switching Between Current Calls When you re on a call and another call comes in your phone screen informs you and displays the caller ID Swipe up to answer the incoming call and place the first call on hold Swipe down to reject the second call Touch to place the current call on hold and switch to the othe...

Page 48: ...y or Name format to set the order of the contacts and the format of the contact names Sounds and vibration Touch Phone ringtone to select the ringtone for incoming calls Touch Also vibrate for calls to enable the vibration when you receive calls Touch Keypad tones to enable the sound which will play when you touch the keypad keys Answer and end calls Touch the Power button ends call slider to enab...

Page 49: ...ng calls to another phone number Call waiting Touch to get notified of incoming calls during a call Blocked numbers Allows you to block calls and messages from certain numbers Voicemail Touch Voicemail for the following options Touch Notifications to configure the settings you want and then touch the Back key when you re finished Touch Advanced Settings and select an option Touch Service to config...

Page 50: ... the apps and touch Contacts 2 Touch to add a new contact 3 Enter the contact name phone numbers and email addresses Touch More fields to enter other information 4 Touch SAVE Searching for a Contact 1 Swipe up the home screen twice from the Home key to view all the apps and touch Contacts and then touch to search 2 Enter the contact name or other information such as phone number you want to search...

Page 51: ...50 Editing Contacts 1 Swipe up the home screen twice from the Home key to view all the apps and touch Contacts 2 Touch a contact you need to edit and then touch 3 Edit the contact and touch SAVE ...

Page 52: ...e thread Touch to write a new text or multimedia message Touch to search for a message using keywords Touch an existing message thread to open the conversation Touch for more options Sending a Message 1 On the Messages screen touch 2 Touch the To field and manually enter the recipient s number or the contact name 3 Touch the Text message field and enter the message text 4 If you want to send a mul...

Page 53: ...you want to send a text message Otherwise you may be charged for a multimedia message The color of the icons and vary depending on different contacts Changing Message Settings Touch Settings in the Messages screen to change the messages settings ...

Page 54: ...t message 2 Touch the address box at the top 3 Enter the address URL of a webpage or enter terms you want to search for 4 Touch a URL or search suggestion or touch on the keyboard to open the web page or search results Using Multiple Browser Tabs You can open several web pages at the same time one page in each tab and switch between them freely Opening a New Browser Tab Touch at the top of the scr...

Page 55: ... Touch and hold an image or a link to a file or to another webpage 2 In the menu that opens touch Download image or Download link The downloaded files are saved to your phone or the storage card You can view or open them in the Downloads app Changing Browser Settings You can configure a number of settings to customize the way you browse the web including several that you can use to control your pr...

Page 56: ...1 Swipe up the home screen twice from the Home key to view all the apps and touch Camera 2 Aim the camera at the subject and make any necessary adjustments PHOTO automatic camera mode is used by default 3 Touch the area on the screen where you want the camera to focus or let the camera autofocus on the center of the image 4 Touch to take a photo WARNING Keep a safe distance when using the flash Do...

Page 57: ...56 Number Function 1 Change the camera settings 2 Change the High Dynamic Range HDR setting 3 Change the flash setting ...

Page 58: ...n spread or pinch with two fingers on the screen to zoom in or out before taking pictures In PHOTO mode when you touch the screen to focus the exposure bar appears beside the focus point You can drag up or down to adjust the exposure Recording Videos 1 Swipe up the home screen twice from the Home key to view all the apps and touch Camera VIDEO 2 Aim the camera at the subject and make any necessary...

Page 59: ... beside the focus point You can drag up or down to adjust the exposure Using Other Camera Modes Your camera app offers other powerful and interesting camera modes Different mode offers different function or effect PORTRAIT Use PORTRAIT mode to focus on your subject with a depth effect and blur backgrounds Touch More from the camera modes and you can see the following modes MANUAL Adjust more camer...

Page 60: ... in full screen and touch and then touch anywhere on the picture to refocus or adjust the blurriness MONO Take a photo with only one colour visible Touch a colour option and then use the range slider to adjust the colour selection to achieve the desired effect TIMELAPSE Set the time interval between each frame when you shot time lapse videos SLOW MOTION Capture slow motion video clips ...

Page 61: ... player controls are displayed at the bottom of the screen Touch the area to open the playback screen Clock Swipe up the home screen twice from the Home key to view all the apps and touch Clock The Clock app allows you to check local time in places around the world set alarms and use timers Setting a New Alarm 1 Open the Clock app and touch 2 Touch a default alarm to configure it or touch at the b...

Page 62: ...pp and touch or 2 Stopwatch allows you to record lap times 99 laps at most while countdown allows you to set a time and count down to zero File Manager Quickly access all of your images videos audio clips and other types of files on your phone and on the memory card Swipe up the home screen twice from the Home key to view all the apps and touch File Manager to check the record Touch folders and fi...

Page 63: ... the recording Google Apps Open the Google apps to use Google services Some apps are put in the Google folder on the home screen NOTE Some contents or Google services may not be available in certain regions Some apps will require you to sign in to your Google account Google Use it search for the information you need Gmail Send and receive emails via your Gmail account or other personal email accou...

Page 64: ... your audio files are cataloged according to the information stored in the files Play Movies TV Use it to watch movies and TV shows online Photos Use it to check and manage your photos Calculator Use it to do the calculations you need Rotate the phone to landscape mode to switch the calculator to scientific mode ...

Page 65: ...e data Access data using mobile network Roaming Switch on to get data service when roaming Enable VOLTE call Enable calling over LTE networks Preferred network type Select the type of network you want to use Automatically select network Select preferred network automatically Network Display the network operator Access point names To connect to the Internet you can use the default APN And if you wa...

Page 66: ... Not Disturb mode Set the Exceptions for Calls and Messages events reminders And configure the Duration and automatic rules of Do Not Disturb mode Switch to vibrate Press the Power key and Volume up key to switch the phone to vibration mode Phone ringtone Your phone comes with a number of ringtones that you can use for incoming calls messages and notifications Default notification sound Select the...

Page 67: ...ion menu touch Google Location Accuracy Google Location History Google Location Sharing to configure Google location options Accounts Swipe up the home screen twice from the Home key to view all the apps and touch Settings Accounts to manage your web accounts and synchronization Touch Add account to sign in to or create accounts on your phone Touch an account type to see that type of accounts you ...

Page 68: ... and touch Settings System Reset options to reset the Wi Fi mobile network and Bluetooth settings app preferences or the phone to factory mode System Update Swipe up the home screen twice from the Home key to view all the apps and touch Settings System Advanced System Update to check download and install system updates ...

Page 69: ...least 10 mm away from your body while making calls Small parts may cause choking Your phone can produce a loud sound To prevent possible hearing damage do not listen at high volume levels for long periods Exercise caution when holding your phone near your ear while the loudspeaker is in use Avoid contact with anything magnetic ...

Page 70: ...urn off when asked to in hospitals and medical facilities Turn off when told to on aircraft and at airports Turn off when near explosive materials or liquids Don t use at gas stations Your phone may produce a bright or flashing light Don t dispose of your phone in fire ...

Page 71: ...xtreme temperatures Avoid contact with liquids Keep your phone dry Do not attempt to disassemble your phone Only use approved accessories Don t rely on your phone as a primary device for emergency communications ...

Page 72: ... can be well below the maximum value This is because the phone is designed to operate at multiple power levels so as to use only the power required to reach the network In general the closer you are to a wireless base station antenna the lower the power output The exposure standard for wireless devices employing a unit of measurement is known as the Specific Absorption Rate or SAR The SAR limit se...

Page 73: ...e SAR levels of various phones and at various positions they all meet the government requirements SAR compliance for body worn operation is based on a separation distance of 10 mm between the unit and the human body Carry this device at least 10 mm away from your body to ensure RF exposure level compliant or lower to the reported level To support body worn operation choose the belt clips or holste...

Page 74: ... uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on...

Page 75: ...ving even with a hands free kit can cause distraction and lead to an accident You must comply with local laws and regulations restricting the use of wireless devices while driving Operating Machinery Full attention must be given to operating the machinery in order to reduce the risk of an accident Product Handling General Statement on Handling and Use You alone are responsible for how you use your...

Page 76: ...a soft material such as cleaning cloth for eyeglass lenses Do not use alcohol or other corrosive substances for cleaning or allow them to get inside Do not expose your phone or its accessories to open flames or lit tobacco products Do not expose your phone or its accessories to liquid moisture or high humidity Do not drop throw or try to bend your phone or its accessories Do not use harsh chemical...

Page 77: ...disposal of electronic products Do not carry your phone in your back pocket as it could break when you sit down Small Children Do not leave your phone and its accessories within the reach of small children or allow them to play with it They could hurt themselves or others or could accidentally damage the phone Your phone contains small parts with sharp edges that may cause an injury or may become ...

Page 78: ...rbag inflates with great force and serious injury could result Store the phone in a safe and secure area before driving your vehicle Seizures Blackouts The phone can produce a bright or flashing light A small percentage of people may be susceptible to blackouts or seizures even if they have never had one before when exposed to flashing lights or light patterns such as when playing games or watchin...

Page 79: ... Templates and Predictive Text Take frequent breaks to stretch and relax Emergency Calls This phone like any other wireless phone operates using radio signals which cannot guarantee connection in all conditions Therefore you must never rely solely on any wireless phone for emergency communications Loud Noise This phone is capable of producing loud noises which may damage your hearing Turn down the...

Page 80: ...hone with sharp objects Connection to Vehicles Seek professional advice when connecting a phone interface to the vehicle electrical system Faulty and Damaged Products Do not attempt to disassemble the phone or its accessories Only qualified personnel can service or repair the phone or its accessories If your phone or its accessories has been submerged in water punctured or subjected to a severe fa...

Page 81: ...m 6 inches be maintained between a mobile phone and a pacemaker to avoid potential interference with the pacemaker To achieve this use the phone on the opposite ear to your pacemaker and do not carry it in a breast pocket Hearing Aids People with hearing aids or other cochlear implants may experience interfering noises when using wireless devices or when one is nearby The level of interference wil...

Page 82: ...rcraft and enable airplane mode of your phone when boarding an aircraft Interference in Vehicles Please note that because of possible interference to electronic equipment some vehicle manufacturers forbid the use of mobile phones in their vehicles unless a hands free kit with an external antenna is included in the installation Explosive Environments Gas Stations and Explosive Atmospheres In locati...

Page 83: ...r contains chemicals or particles such as grain dust or metal powders Blasting Caps and Areas Power off your mobile phone or wireless device when in a blasting area or in areas where signs are posted to power off two way radios or electronic devices to avoid interfering with blasting operations ...