Introduction
First you should check if your phone is network locked.
Insert a different network SIM card.
If your phone shows messages "SIM network unlock PIN", it's network locked.
To buy a network unlock code you need the correct IMEI & model number.
With inserted an Unauthorized network SIM card, enter the unlock code provided from your supplier.
What you need
Video Instructions
Conclusion
To reassemble your device, follow these instructions in reverse order.
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