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If the Phone says Sim rejected means it locked to Network,You need to Unlock it,you can get the unlock code from the site Unlocking4u.com/unlock-your-phone/rs6wp2/ and Unlock it from Network Lock,Then You can use any GSM Network Sim card in NOKIA 1280.
switch off your mobile and keep away your sim, insert another working sim in the mobile and turn-on your mobile... if this sim is working, then turn off your mobile and re-insert your old sim. now it will work. in case mobile is not working with new sim, you have to replace the "signal chip" of your mobile. Best of Luck! Pawan Verma
Initially remove your battery and insert your sim card after cleaning the sim card and the slot.If the problem persists check any other sim card is working in your mobile if so check your sim card with other mobiles.If your sim card not works in other mobile contact the customer care of your network operator .
Here is two possibility either you used sim in wrong slot like you have nano sim and you used into micro sim slot or other different slot. or your mobile is sim locked and that is why it not accepting at&t sim. here is how to unlock at&t simcard.
As your att sim working fine with blackberry so sim is fine no issue with sim card. on which mobile you have tried this sim as you have not mentioned your other mobile it is same as blackberry or apple or samsung mobile.