“If I already have a plan with T-Mobile but want to buy this separately and completely. Am I able to just put my old SIM card in when the phone arrives and be good to go?”

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• Absolutely! That's what I did. I then called t-mobile to confirm the new phone shows up in their system.

  Answered by Awesomeness 2 years ago

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• Once you buy the phone from Best Buy, you have to activate the phone through Best Buy online and you'll be set. Basically put the sim card in, go to the phone help tab and activate it.

  Answered by Brownferno 3 years ago

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• Yes, I preordered my iPhone and the new sim card was not activated. I swapped my old sim card into the new phone and it worked.

  Answered by ralfff 3 years ago

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