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You may have a sim card problem. Try using another sim your the phone and vice versa try your sim in another phone. Make sure you are trying your sim in another phone from the same network or a sim free phone.
This will tell you whether the problem is with your sim card or phone.
I have nokia 6630 mobile phone, from last 2 week i am unable to start my handset on General mode its goes on "OFFLINE Mode" this happening for all SIM cards and for all service provider. But i can use only one particular SIM card and its works normal, i am not able to access my own SIM card...!!! I had re-stored original setting twice and formatted once(Green * 3) still it is not resolved, So please suggest is their any setting to do in handset or it is some major problem- Amol