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Try the following solutions. If the problem is still not resolved, contact a Sigma mobile Service
Centre.
Restarting the device
If your device does not react on pressing the keys or freezes you may need to close
apps or turn off the device and turn it on again.
Forcing restart
If your device is frozen and unresponsive, press and hold the Power key and the Volume Down
key simultaneously for more than 7 seconds to restart it.
Resetting the device
If the methods above do not solve your problem, perform a factory data reset. On the Apps
screen, tap Settings → Backup and reset → Factory data reset → RESET DEVICE. Before
performing the factory data reset, remember to make backup copies of all important data
stored in the device.
Calls are not connected
Ensure that you have accessed the right cellular network.
Ensure that you have not set call barring for the phone number you are dialing.
Ensure that you have not set call barring for the incoming phone number.
Others cannot hear you speaking on a call
Ensure that you are not covering the built-in microphone.
Ensure that the microphone is close to your mouth.
If using a headset, ensure that it is properly connected.
Sound echoes during a call
Adjust the volume by pressing the Volume key or move to another area.
A cellular network or the Internet is often disconnected or audio quality is poor
Ensure that you are not blocking the device’s internal antenna.
When you are in areas with weak signals or poor reception, you may lose reception. You may
have connectivity problems due to issues with the service provider’s base station. Move to
another area and try again.
When using the device while moving, wireless network services may be disabled due to issues
with the service provider’s network.
The battery icon is empty
Your battery is low. Charge the battery.
The battery does not charge properly (For Sigma mobile-approved chargers)
Ensure that the charger is connected properly.
Visit a Sigma Mobile Service Centre and have the battery replaced.
The battery depletes faster than when first purchased
When you expose the device or the battery to very cold or very hot temperatures, the useful
charge may be reduced.
Battery consumption increases when you use messaging features or some apps, such as
games or the Internet.
The battery is consumable and the useful charge will get shorter over time.
Your device is hot to the touch
