the sim card just holds network information not phone information so yes you can transfer your sim card without any problems i had a sim card from about 3 years ago and i just bought a iPhone 3GS and it works fine in it
Yes but you will not get the benefit of the 3G speed. Any AT&T SIM can be used in any AT&T device, except for the micro-SIM in the iPhone 4.
If your 3GS is locked, you can't insert a SIM card.
yes. once an iphone is universally unlocked it will work.
Yes, iPhones use a normal sim card.
An Apple iPhone 3GS can be purcased unlocked without a SIM card and used with a local carrier's SIM card. Once purchased it is as simple as inserting a SIM card from the carrier of your choice.
Try turning it off then back on with the sim card inserted
A SIM card is a small card with a chip on it that contains data pertaining to your network provider and your personal cell phone number. No phone will work adequately without a SIM card; you will only be able to make emergency calls from a phone, even an iPhone 3GS. You will still have to insert your SIM card into your iPhone after a factory shutdown to be able to use the phone to make/receive calls, texts etc.
You either have to purchase an unlocked iPhone or jailbreak and unlock it yourself after you purchase it. This process does void any manufacturer warranty.
No
yes a plateau sim card will work on the iphone all you have to do is go to plateau and have them unlock it.
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.
Yes the iphone 4 uses whats called a micro sim card it is smaller then the regular sim card out there. At www. phonetraderonline.com they can custom cut your existing sim card or provide you with a micro sim for your carrier.
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.