Mate, if you look at your iPhone's headphone jack, you will see a quite small hole next to it. All you need to do is insert a pin into that hole and the tray will pop open on top on the phone.
No
any AT&T phone that can take that sort of sim card.
You put a sim card in it.
Yes, Yes you can.
Yes as long as the phone is att and has a sim card slot
If your 3GS is locked, you can't insert a SIM card.
Yes, but only if you unlock you iphone
As long as it is AT&T, yes.
the iphone has a sim card which slots in the top of the iphone. to get the sim card tray out you have to use a pin or the special tool it came with to open it.
Yes it can be swapped. I actually swapped my razr's sim card to my iphone. Nothing happened. It works perfectly.
Yes, you will have access to all the features. It doesn't matter what SIM card is in your phone because the phone needs a SIM card, given to you by a carrier, that is supported by the phone to operate. Just put the SIM card in the HTC Wildfire and put it in the iPhone.
Put sim card into nokia, go into Contact list -OPTIONS > MARK ALLOPTIONS > MOVE SELECTED (Choose sim card)Put sim card into iphone...SETTINGS > MAIL, CONTACTS, CALENDERScroll down a bit > IMPORT SIM CONTACTS ;)frisky