You can unlock the Nokia C3 with its IMEI no. You need to provide IMEI no of your Phone. To get IMEI no of Phone dial *#06#. It can be printed/engraved on the backside of the device also. The warranty of your Phone will not be disturbed. Unlocking is available for all network providers. Unlocking is restricted to Sprint, Verizon and US cellular carrier.
You need to provide the correct network of your Nokia C3. Your Phone will be unlocked from the network provided by you. Do not select the wrong network or check twice before placing an order. If you select the wrong network then Phone will not be unlocked and there will be no refund.
Your Nokia C3 will be unlocked by the official manufacturer server. After unlocking your Phone it will work on all network SIM cards. Your device stays unlocked even after updating the system and factory resets.
You need to check before placing an order that your Phone is not blacklisted. This means that your Phone should not be stolen, bills not paid, lost, or damaged. If your iPhone is blacklisted then it will not be unlocked by this method.