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phone, or upgrade of the software. Please
backup your important phone numbers.
(Ring tones, text messages, voice messages,
picture, and videos could also be deleted.)
The manufacturer is not liable for damage
due to the loss of data.
o Do not turn your phone on or off when the
phone is close to your ear.
Troubleshooting
1. The SIM card is dirty. Clean
it.
2. Reinstall the SIM card.
3. The SIM card is damaged.
Replace it.
Check the signal strength icon on
the screen. If the icon contains 4
bars, it indicates the signal is the
strongest; if below 1 bars, it
indicates the signal is very poor.