What is your Phone Brand and it's Model?
Make sure that your phone has been unlocked....If the Phone Locked means if you insert Other Network Sim card means it says invalid Sim or Sim card error...So find out the Network and country locked now,all network locked Phones cannot be unlocked ,Some Network locked Phones can be Unlocked.It depend on the brand of the Mobile also,you can unlock it using the Unlock code,You can get the Unlock code from the
Theunlockarena.com and Unlock it,after Unlocked the Phone use any GSM Network Sim card,You cannot use the CDMA Network Sim Card in the Unlocked Phone,Only GSM Network locked Phones can be Unlocked...
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