In America, the two SIM-using GSM carriers are AT&T and T-Mobile.
T-Mobile can only use it's EDGE network on an iPhone with a SIM Card needed.
You must have a SIM card for the carrier you want to use and the phone must be compatible with that carrier.
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.
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.
If your iPhone is unlocked, then yes, all carriers will work. But if it is locked to a certain carrier, then you will have to unlock it using a jailbreak.
yes, provided the network carrier provides the micro sim required for the phone.
the micro sim is only compatible in the iphone 4 and 4s because they are the only phones that it will fit in through att
No. The sim card would not be inter-carrier compatible.
You need one with a SIM Card slot. From there, find a GSM carrier, buy a SIM card and slip it in. (T-Mobile, AT&T, and every European carrier is GSM).
A standard sim, so no microsim like with the iphone 4. Just see if your device is not carrier locked, in that case you need a simcard from that specific carrier
Sure. As long as your iPhone model has the SIM Card slot. Just make sure your LG uses Micro SIM Cards, or else you just have to cut your SIM Card to fit.
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.
it depends where yo buy it like att or virizon but if you want it for a diffrent carrier than the original you will have to visit unlockatt.com