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[amador]

Can one use Mexican SIM cards on American cell phones?  I understand that in the US they are capped to work with a specific brand.

I travel to Mexico often and I know that you can put the SIM card of a national company on a European or Indian phone.  Alas, I only have two T-Mobile phones with me at the moment.

Thanks.

[doctor_torrseal]

You need to get an unlocked phone.  unlocked = can be used with any SIM, not just the branded carrier's.  If you are a T-Mobile customer, T-Mobile will supposedly unlock the phone for you (with limitations - one every six months, or after the phone is six months old, or something like that) at a store.  Find more information with google or at www.howardforums.com.