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Discuss [iPhone 3G] Can an iPhone 3G SIM Card be used on a First Generation iPhone? at the iPhone 3G - Hackint0sh.org; I have a first generation iPhone, and I will be purchasing the iPhone 3G on ...
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    Master Fraggle Rocker Array vandy1997's Avatar

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    Default [iPhone 3G] Can an iPhone 3G SIM Card be used on a First Generation iPhone?

    I have a first generation iPhone, and I will be purchasing the iPhone 3G on July 11 and possibly using my first generation iPhone until a jailbreak and unlock method are available (hopefully) for the iPhone 3G. I am an AT&T customer, and it seems like AT&T is not using the SIM card from the first generation iPhone and is activating a new SIM card on the iPhone 3G. Does anybody know if the iPhone 3G's SIM card can then be used on the first generation iPhone, if necessary? It may be that nobody knows at this point, and I will ask the AT&T reps when I purchase the iPhone 3G. Thank you for any input!
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    Quote Originally Posted by vandy1997 View Post
    I have a first generation iPhone, and I will be purchasing the iPhone 3G on July 11 and possibly using my first generation iPhone until a jailbreak and unlock method are available (hopefully) for the iPhone 3G. I am an AT&T customer, and it seems like AT&T is not using the SIM card from the first generation iPhone and is activating a new SIM card on the iPhone 3G. Does anybody know if the iPhone 3G's SIM card can then be used on the first generation iPhone, if necessary? It may be that nobody knows at this point, and I will ask the AT&T reps when I purchase the iPhone 3G. Thank you for any input!
    I can guess they will be compatible. Here is why:

    1. Same network

    You will just need to have the iPhone Activated for it to accept the SIM from your current iPhone. As per data, I'd don't know what to say.


    Now, I did ask a AT&T rep and she told me the following [bear in mind reps barely know anything up untill the actual day]:

    "No, because you have to activate the SIM and the phone first. Another SIM won't just work because that other SIM has to be programmed for the new phone. Same with the phone. It has to be programmed to accept a new SIM different from its current one."
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    If its a 3g sim then im guessing it wont work. The reason is that the old phone wont be compatible. 3G phones are backwards compatible, so they can use 2G sim cards, but 2G phones cannot use 3G sim cards. This is why the 3 network sim cards could never be used in any other phones apart from their own.

    I think this is right but correct me if im wrong.

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    Senior Professional Array DayvG's Avatar

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    I'm using my vodafone 3G capable sim card in my iPhone just fine so I cant see why it would be a problem. The only restrictions as far as sim cards go in the UK was sim cards from the network 3 (as far as i'm aware).
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    Master Fraggle Rocker Array vandy1997's Avatar

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    If that is the case with AT&T (that you cannot use a 3G SIM on a 2G phone), then it would mean that you would have to have a 3G phone as a backup phone. That would be a pain in the neck. And if there is a problem with the battery that cannot be replaced, then you will have to be stuck without a phone (unless if you can get to an AT&T or Apple store to switch it out). I want to keep my first generation iPhone for the time being because it is a 16GB (so it holds an ample amount of content), and it is jailbroken and unlocked (so it's useful when I travel abroad and to install apps through Installer - with the restrictions that Apple is imposing with the App Store, it seems like Installer will thrive, as developers who are developing MMS apps and GPS apps will not be able to sell them in the App Store without a major waiver from Apple). But I may have to sell it if I cannot use it with the 3G SIM. I hope that this is not the case, but we will see. At least all of these questions will be answered by Friday!
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    The SIM card is not 3G/2G!

    It is the phone that is important.

    The SIM just connects you to the network and uses whatever system the phone uses!

    I can put in any SIM card from a 3G phone I have and it still works.

    As long as you jailbreak your old phone then the new SIM from the new iPhone will work in the old one.

    I have to be honest though - it looks like App Store will have all the good applications and that any wait for a jailbreak won't seem so bad as a result!
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    Amazingly Knowledgeable Array DJ McG's Avatar

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    You will most likely be able to use it because:

    1. It is the same carrier
    2. The current iPhone SIM Card says 3G on it anyway
    3. Any AT&T SIM Card is usable in any AT&T Cellphone (from my knowledge anyway)


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    Quote Originally Posted by Spinstorm View Post
    The SIM card is not 3G/2G!

    It is the phone that is important.

    The SIM just connects you to the network and uses whatever system the phone uses!

    I can put in any SIM card from a 3G phone I have and it still works.

    As long as you jailbreak your old phone then the new SIM from the new iPhone will work in the old one.

    I have to be honest though - it looks like App Store will have all the good applications and that any wait for a jailbreak won't seem so bad as a result!
    The sim card is 3G/2G, both the sim card and the phone are either 3G or 2G. I know this because in order to benefit from 3G internet speeds, video calling etc with my current phone i had to buy an Orange 3G sim card from ebay, as the only other way you can get one of these sim cards is by purchasing an Orange 3G phone. The sim cards that orange sell on their own are only 2G sim cards.

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    all att sims at least for the past 2-3 years are 3g sims (notice the 3g written on them) so yes it will work, provided your sim is not very old and that you can activate/hactivate it

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    Master Fraggle Rocker Array vandy1997's Avatar

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    I understand all of your points. But I have read that AT&T and Apple will not allow us to use the SIM from our first generation iPhone on the iPhone 3G when we purchase the iPhone 3G. They will activate the iPhone 3G with a new SIM, and the old SIM will be useless, I guess. What is the reason for this? It seems like a waste of money and plastic. Is it just because it will be faster than switching out the SIMs, or will the new SIMs on the iPhone 3G contain other information or restrictions? I hope that it is the former and not the latter. I will ask on Friday, if there isn't a huge line and I am able to get it then! Thank you all for your input!
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