Question

 If you switch your sim card with a iPhone will it work?

Answer yes it will. but know that if you remove a sim card from an iPhone, from that point on the sim card will be more prone to fall out.
http://wiki.answers.com/Q/If_you_switch_your_sim_card_with_a_iPhone_will_it_work

Top Q&A For: If you switch your sim card with a iPhone will ...

Can you switch a go phone sim card with a iPhone sim card?

most of the improvements (speed, new apps, fixing bugs, etc.) are just software changes, so your old iphone 3g is basically the same as the 3gs with the free software upgrade, the only real differe... Read More »
http://wiki.answers.com/Q/Can_you_switch_a_go_phone_sim_card_with_a_iPhone_sim_card

From How can i switch me sim card to iPhone?

Can I take the SIM card out of my Iphone 3G and put it in a friend's older iPhone not a 3G and expect my basic phone services and mail to work?

Stick a paperclip into the little hole on the top, and the SIM card should pop out.
http://wiki.answers.com/Q/Can_I_take_the_SIM_card_out_of_my_Iphone_3G_and_put_it_in_a_f...

If you buy an iphone 4 from the U.S and bring it to Australia wil it work. do i just have to unlock it. can you do that. what sim card does it work with?

If the iPhone is factory unlocked,yes u can use it If not,nope U have to jailbrake it and unlock it. Still no unlock for the 4-th iPhone Maybe the next week it's gonna to be a release
http://wiki.answers.com/Q/If_you_buy_an_iphone_4_from_the_U.S_and_bring_it_to_Australia...


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