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If your 3GS is locked, you can't insert a SIM card.
In theory, yes. T-Mobile is actually the carrier for the iPhone in Germany. Keep in mind, however, that unlocking an iPhone completely voids its warranty, and if anything happens to it, the only recourse is to purchase a new iPhone. Apple will not service a broken iPhone if it is unlocked.
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
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Yes it does but it is locked to t-mobile America
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.
erm depends if its locked into a contract or not if it is be sure it is locked into the "3" network
The little tab on the side of the SD card has been moved to the 'locked' position. When that happens, no data can be written to the card, nor can anything be deleted from it.
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.
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.
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.
iPhone 3GS uses a normal SIM Card, iPhone 4 uses a Micro SIM Card. If you buy an iPhone 4 you have to choose an operator which sells/supports Micro SIMs. Note that depending where the iPhone is brought (Apple, Verizon, O2) it might be locked to a certain operator.