Step by step guide for new user

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Baseband version

At first, you need to know the phone model and firmware version.

To check this, you can go to settings - about the phone - program information - basic version (various phones may vary) or connect the phone to your computer and click "read information" in the utility.

Then check the operator and lock type.

Insert a SIM card of another operator. The phone will tell you that it is locked ("Invalid Sim Card") or ask for codes.