Hi is your Nokia 2730c mobile is asking for restriction code once you insert your sim in it then it mean the phone is locked to some other network provider due to this it wont accept any other GSM sim until you unlock it ..You can purchase restriction code from online providers like WickedUnlock.com for reliable cost ..You first check that whether the code is available for your country and network provider ...If yes then pay for it and unlock the phone then freely use it with any GSM sim ...
