Verizon doesn't use SIM cards, so the Verizon iPhones presumably don't. All AT&T iPhones have a SIM card, though.
There are some iphones that do have dual sim cards.
Yes, they most definitely do.
Yes, iPhones use a normal sim card.
no they are not
iPhones need a SIM card to work as a phone. If you don't have a SIM card you can use it as an iTouch.
No. The iPhone 5 has a Nano SIM slot.
all iphones have a sim slot but on the original iphone the customer cannot easily access it whereas the 3G iphone has the sim card and a sim card ejector tool How can I access my verizon iphone 4 sim card slot that doesn't have a sim tray
Yes you can ring on any sort of Iphones. But only if they have signal and a sim card inserted.
Yes. AT&T is a GSM carrier, meaning all the phones are GSM phones, meaning all the phones require a SIM card to work on a GSM network.
Cellcom in Wisconsin does not have sim cards, wish they did. I have heard that you can get a sim card from them but non of their phones have a spot for sim cards.
Virgin Mobile now uses sim cards and ATT and other carriers only what customers to use their phones, so the phones are locked for use only on their network. If you get an unlocked cell phone you can use it on any carrier that uses sim cards. NOTE: Tmobile and prepaid carriers don't have Iphones on the service.