First Option:
Phone in the Other Sim and check the Phone Network Signal If Network Signal Problem not Solved So
Secend Option:
Your Phone Network IC Fault So Please change Network IC
And Network Signal Problem will Solved
if it is there isn't much you can do on this side of the network.
Contact your phone company.
Warning : Do not enter
any wrong unlock codes on your Nokia N900 mobile phones. If you enter
over a certain amount of wrong unlock codes on your Nokia N900 mobile
phone, your phone may get hard locked and sometimes become unusable.
1 - Switch on your Nokia N900 without any sim card.
2 - Don't bother as to what is displayed on your Nokia N900.
3 - Compose #pw+CODE+1#.
4 - The Nokia N900 would then display the message "SIM Restriction Off" and will be unlocked!
Note :For Nokia N900 mobile phones locked to the network Fido or Rogers in Canada follow these instructions :
1 - Switch on your Nokia N900 without any sim card.
2 - Don't bother as to what is displayed on your Nokia N900.
3 - Compose #pw+CODE+7#.
4 - The Nokia N900 would then display the message "SIM Restriction Off" and will be unlocked!
The letter p appears if you press the button star(*) three times quickly
The letter w appears if you press the button star(*) four times quickly
The symbol + appears if you press the button star(*) two times quickly
The CODE you need to enter is the unique unlock code for your Nokia N900
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