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You can put any SIM card in an unlocked cell phone.

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Q: Can you put an att card in an unlocked tmobile sidekick?
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What ATT phones can you use with tmobile?

Absolutely, I do. ... Yea, but only if you buy it unlocked


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what unlocked phones can be used with an ATT account We need to replace an ATT phone, don't want to pay retail for a new phone and aren't ready to renew the 2 year contract?

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How can you use an AT and T Samsung Infuse 4g on TMobile?

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Does a nextel sim card work on the blackberry curve?

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