Have you inserted a valid SIM card? what is the problem? when you insert you Sim into your mobile do you any of the message like this "Enter Restriction Code or Enter Unlock Code" if so your mobile is locked to your current network and unless otherwise you unlock it,you cannot use your mobile with other provider's sim in your contracted mobile..you can unlock your mobile by unlock codes and for codes you can contact your provider or can get it from online providers..once i got unlock code for my mobile from mobileunlocksolutions and unlocked my mobile..you can too try getting codes from them and get your mobile unlocked..and before unlocking your mobile get clear idea about unlocking procedure..visit mobileunlockguide to get step by step instructions about unlocking your mobile..
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