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Answers to your questions
The telephone does not turn on
-Remove the battery and then replace it.
or
-Connect the telephone to the charger (check that this is plugged in) for approximately 5 minutes.
No network recognised
-Remove the SIM card. Check that there is no dust or grit in the SIM slot. Replace the SIM card being sure to push it right up to the stop point.
Calls to a messaging service or voice server do not get through
-Check in the RNG & BEEP / SEND DTMF menu that the box is ticked.