Yes it can!
Any sim card, Any country, Any price plan.
All you need is a small fingernail to remove the lid and add the sim card in!
any AT&T phone that can take that sort of sim card.
Of course, the iPhone 3G and/or the original iPhone will take any normal sim card; the 3G iPhone will take the 3G sim as well.
No, You cannot use reliance CDMA sim card (or) any other CDMA card sim card on Apple iphone 4s. Any GSM Sim card will work on factory unlocked Apple iphone 4s but not CDMA sim ONLY IN INDIA.
yes you can if ur iphone is unlocked you may have a choice of any sort of simcard but if its locked you can only have that type of simcard
It depends if the original phone the SIM card belonged to was saving them to the SIM card itself. Here's some clarification: The SIM card will retain contacts from a previous phone. The iPhone will not recognize SIM contacts until they are imported to the Contact list via Settings > Mail, Contacts, Calendars > Import SIM Contacts The iPhone does not save contacts to the SIM card, and therefore if the SIM is from an old iPhone there won't be any SIM contacts present.
Unlocking the iPhone allows you to use any service that requires a sim card.
Assuming the SIM card is the correct size for the iPhone (ie not a micro SIM) - there's no reason why not. Since you say it's unlocked - it should accept any networks SIM card.
OF COURSE , all phones HAVE to have a sim card to work because it must store your number and any information you put on the phone. i think it may work without one , BUT i dont think you can save contacts or even get calls.
no that would not work at all unless you are calling the police. the sim card contains memory that the company puts on it like what type of data you have. when you insert a sim card the phone checks to see its data. if you insert it nothing will happen exept it will say no sim card emergency calls only
Provided its a micro sim and the handset is not locked and the provider actually provides a service for the iPhone 4S then there should be no problem.
you can take a sim from any phone and put it into an iPhone. they will all work the same, just make sure you call you phone company to let them know your going to switch phones
Legally you do. But you can unlock your iPhone with the pwnage software which allows you to use any service that has a sim card.