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T-Mobile: How to change the SIM lock pincode ...
August 15, 2015 12:18 AM
I have only tested this with the Dutch T-Mobile, but this is how you change the "SIM Lock" pincode:
You'll have to dial a specific code, in this format:
For example, if your old pincode was "0000" (the default setting), and you'd like to change it to "1234", then you dial:
And press the "Dial" button on your phone.