M155 settings
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6. Simultaneously press both keys for a short
time.
The M155 returns to the idle mode.
Audio settings
The user can set the following audio related options:
Defining the ring melody (for voice calls)
Defining the notification option
Defining the silent option
Defining the ring melody
The M155 contains 12 available melodies for incoming voice calls.
To select the required ring melody, perform the following steps:
1. Simultaneously press both keys for a short
time.
2. Repeatedly press the Upper key for a short
time until the display shows:
Audio
3. Press the Lower key for a short time.
4. Repeatedly press the Upper key for a short
time until the display shows:
Ringtone
5. Press the Lower key for a short time.