switching sim card into different cell phone?

ok so i have 2 phones both from tmobile. i just got the new sidekick from tmobile in June, but i kept my old phone. then i heard if u switch the sim card into my old phone it will then work again. i did this and it worked. is this bad for my phone, or will it damage it. i know that is what the workers at the phone store do when u get a new phone. will my billing be the same, like i have texting, will i be charged if i text on my old phone but put my sim card into it. also is this bad to do or against the law?

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  • 1 decade ago
    Best Answer

    It's not bad for your phone. This is one of the great advantages of GSM technology. Use the phone you want to use.

    I have about 6 GSM phones (and a bunch of SIMs for different providers) and I move them around all the time.

    Source(s): GSM junkie
  • 3 years ago

    2

    Source(s): 100% Free Cell Phone : http://FreeCellPhones.iukiy.com/?fMsd
  • Anonymous
    4 years ago

    As long as it's a tmobile phone it will work.. T-mobile phone dont care

  • Anonymous
    1 decade ago

    Its fine

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  • its fine

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