unlocked phones???? please help?

do these really work??? if i bought a at-t phone (blackjack) , if it was unlocked could i really just put my sim card in it from tmobile..and it will work???

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  • 1 decade ago
    Favorite Answer

    I think blackjacks are only on AT&T at the moment. You can get an AT&T sim card and just put your T-mobile sim card in it. It should work. Yes, make sure the Blackjack is unlocked.

  • Jack P
    Lv 5
    1 decade ago

    The answer just before this one is incorrect. While it is true that AT&T and T-Mobile use different frequency bands, the phone you are inquiring about (Blackjack II) is Quad-band. It works on all 4 GSM frequencies that are currently used by cell phone companies worldwide.

    Yes, it will work.

  • Woody
    Lv 5
    1 decade ago

    Yes, but AT&T and T-Mob each use 2 frequencies. Only one is common between them. Depending on where you live, your coverage could be lousy.

    Text messaging and the internet may not work at all due to firmware differences.

  • 1 decade ago

    yes an unlocked phone will work with any sim card/gsm carrier

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  • Anonymous
    1 decade ago

    yes it works. but it is illegal for some countries. check it first.

  • 1 decade ago

    It should, I have done it.

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