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Do all iPhone 4s have sim cards? So they are both GSM and CDMA

I'm trying to buy an iPhone 4s but was wondering if they ALL take sim cards.

My friend is offering me a CDMA iPhone but I am with T-Mobile (GSM Network).
Would I be able to use it on T-Mobile if I got the new sim card? I'm hearing mixed answers and would like to hear a straight answer.

Thank you so much!

iPhone 4S

Posted on Sep 25, 2012 4:18 PM

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4 replies

Sep 25, 2012 4:25 PM in response to carl wolf

Because I'd like to find out which answer is right. Just wondering though, why are they called worldwide phones? I heard that's why I would be able to use a Verizon (for example) on T-Mobile? And I have another friend who has a Verizon iPhone but is using it on T-Mobile.. I'm not sure how but would not like to purchase an iPhone to find out that I wouldn't be able to use it. Thank you!

Do all iPhone 4s have sim cards? So they are both GSM and CDMA

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