Does the Apple iPhone 4S from Bell use a SIM card and can you use it in other countries?

i know iPhones from Rogers and fido is with sim,but bell and telus's phones sometimes comes w/o sim and is lock.just need an info before I decide.tnx




The Apple iPhone 4S can be used with both GSM and CDMA networks. It has a SIM card slot and can be used in other countries as long as it is unlocked.



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