ANSWERS: 3
  • You can keep your phone, but you'll need a new card.
  • you can keep the phone but they will need to give you an at&t sim card.
  • Your phone would first need to be "Unlocked" so that the AT&T sim will function in your phone. The sim cards are exactly the same just the sidekick is network locked to only Tmobile. Tmobile is usually very customer oriented if its a post paid and not prepaid sidekick then customer care should be able to provide you with the unlock code if you haven't recently requested one on the same account, however the sidekick is branded specifically for use on the Tmobile network so they may not be so quick to release the code. I have known of Tmobile providing unlock codes for people traveling overseas.

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