Question

 How to Use a Different AT&T SIM Card in an iPhone?

Answer When you purchase an iPhone from AT&T, the phone is "locked" to the carrier's network. That means it isn't possible to use the phone with another mobile service provider unless the device is "unloc... Read More »
http://www.ehow.com/how_8505233_use-att-sim-card-iphone.html

Top Q&A For: How to Use a Different AT&T SIM Card in an iPhone

How to Enable an iPhone 4 on a Different SIM Card?

With the growing popularity of the iPhone 4, you may want to use the phone on another network than AT&T and Verizon Wireless. However, if you want to use the iPhone 4 on another network, you have t... Read More »
http://www.ehow.com/how_8497223_enable-4-different-sim-card.html

Does the new iphone 4 use a different sim card?

Yes , it uses a card called a micro sim . Its a quarter the size of the normal sim cards , allthough you can modify the normal sim cards to work in the iphone 4 !
http://wiki.answers.com/Q/Does_the_new_iphone_4_use_a_different_sim_card

Can you put a different phone card an a iPhone 4?

yes you can :) from like Verizon or at and t im pretty sure
http://wiki.answers.com/Q/Can_you_put_a_different_phone_card_an_a_iPhone_4

If you have an iPhone 3gs running 3.1.3 software if you have it unblocked and put a different sim card in can Orange block your terminal?


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