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Check whether your Sim is placed properly in the slot. Try to reinsert the Sim. still if you face the same problem then your phone might be locked to particular Network. To solve this problem you need to get your phone unlocked. You can unlock your Samsung Galaxy S3 phone using unlock code. Unlock code is the best and safest way to unlock phone.You can get the unlock code for your phone from your Network service provider or any third party online vendors like SimpleUnlocking.com here you need to specify your country, current Network name, IMEI number of your phone. Then they deliver unlock code to you through mail with unlocking instructions. Using this you can unlock your phone from Network lock easily.
You can unlock your Samsung X507 using unlock code. You can get the unlock code from MobileUnlockSolutions.com . There you have to give your Country and current network name along with your IMEI number to get the unlock code. They will give you the unlock code along with instruction on how to unlock. Follow the instruction correctly and unlock your phone. After unlocking you can use it with other networks.
To get the Restriction Code at low cost for your Nokia X2-02 visit TheUnlockSpot.com here you need to specify the IMEI number of your phone and Country,Network provider to which it is locked.Then they deliver the code to you through E-mail.Using that code you can unlock your phone easily.After unlocking it,you can use freely any GSM network Sim card on your mobile.This is the easy,safe and permanent unlocking method.