No
No sim cards are only for numbers
There are some iphones that do have dual sim cards.
Yes, iPhones use a normal sim card.
The iPhone uses the micro SIM card
Yes it can be swapped. I actually swapped my razr's sim card to my iphone. Nothing happened. It works perfectly.
Iphone uses sim cards to track the user and gets all hidden information from them
Buy a SIM Card from AT&T or T-Mobile called a Micro-SIM. These will fit in the iPhone. Apple is planning on using Nano-SIM Cards which are even smaller.
Yes all iPhone have SIM cards although they are called micro sims (the gold chip only)
Not anymore than ks to SIM Cards and the 4S's dual-antenna ability.
Supposedly the 1st gen with fw 2.1 does (Vodafone 2v1 sim)
Sprint doesn't use SIM cards...
To get service on your iPhone 3G after switching SIM cards from another phone, insert the new SIM card and restart the iPhone. Ensure that the SIM card is activated and compatible with the iPhone. If prompted, follow any on-screen instructions to set up your network settings. If there are issues, you may need to contact your carrier for assistance with activation or compatibility.