ZTE Corporation A12 Manuale Utente

59 

Troubleshooting 

Is it a malfunction? If you have a problem with your phone, first refer to this 

Troubleshooting Guide as you check with your phone. If you can’t solve, please contact 

your dealer. 

1. “Enter PIN” is shown when the phone is switched on. 

Input the PIN1 code or input the new PIN if you have changed the code. The code can 

be set “Off” if you do not want to input. (Please refer to Section “Settings”.) 

2. “Insert SIM card” is shown when the phone is switched on. 

Turn off your phone and make sure that you have inserted a valid SIM card. 

3. “Unlock” is shown when the phone is switched on. 

Press Unlock, enter the handset lock code or the new code if you have changed it, and 

then press Ok. 

4. 

No key tone when pressing keys. 

Check the key tone setting in the profile.