I purchased a ZTE phone from Walmart with a FamilyMobile sim card included that operates on T-Mobile. I do not like the plans available so I did not activate the phone. I have just purchased a T-Mobile sim starter kit and would like to activate the phone directly on T-Mobile--is this possible? I also have the unlock code but do not know if It needs to be unlocked as I am going to use the T-mobile network that it is locked to.
If you are certain it operates on T-Mobile (FamilyMobile works with several carriers), it shouldn't be an issue.
If it doesn't work, sounds like you have the unlock code anyway which would make the device usable so long as network compatible!
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