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sim lock
How do I lock a device Sim on my plan
On my phone I go to settings. Connections. Sim manager and can do a sim lock from there. This requires a pass code in order to unlock the sim for use on my phone. This way no one can remove and add a new sim to my phone without this pass code. Also is required if my phone is restarted before the phone can be used. Not sure if this is the type of sim lock you were looking for.
should already be locked to TMO. where did you buy them from and how long have they been on your plan?
