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Thread: What is the difference between AT&T 3G and 4G SIM cards?

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    What is the difference between AT&T 3G and 4G SIM cards?

    Is the 3G 64K sim card different than other AT&T sim cards?

    It there a dedicated 4G card?

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    The ability to access 4G networks is an element of the phone you are using and not the SIM card (assuming you are in a 4G network area). In other words, you won't access 4G with an incompatible phone no matter what SIM is in the phone.
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    Quote Originally Posted by veriztd View Post
    The ability to access 4G networks is an element of the phone you are using and not the SIM card (assuming you are in a 4G network area). In other words, you won't access 4G with an incompatible phone no matter what SIM is in the phone.
    Dam, I was going to steal a 4G SIM and use the piss out of it!
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    Quote Originally Posted by rcr22b View Post
    Is the 3G 64K sim card different than other AT&T sim cards?

    It there a dedicated 4G card?
    Yes, there's a dedicated SIM card for LTE
    http://www.electronista.com/articles...ady.sim.cards/

    The picture shows that the contact section is thinner than the current square looking contacts. I'm pretty sure there are other differences, but until somebody has done memory dump of the contents of the LTE AT&T SIM card the only known difference is the physical contacts.

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    Quote Originally Posted by i0wnj00 View Post
    Yes, there's a dedicated SIM card for LTE
    http://www.electronista.com/articles...ady.sim.cards/

    The picture shows that the contact section is thinner than the current square looking contacts. I'm pretty sure there are other differences, but until somebody has done memory dump of the contents of the LTE AT&T SIM card the only known difference is the physical contacts.
    Thanks for the information.

    That is very helpful.

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    Physical contact design is decorative and meabs nothing. LTE needs different programming as I understand it.

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    Quote Originally Posted by i0wnj00 View Post
    Yes, there's a dedicated SIM card for LTE
    http://www.electronista.com/articles...ady.sim.cards/

    The picture shows that the contact section is thinner than the current square looking contacts. I'm pretty sure there are other differences, but until somebody has done memory dump of the contents of the LTE AT&T SIM card the only known difference is the physical contacts.

    The answer, much like during the 3G transition, is probably yes and no.

    AT&T is rolling out LTE SIM cards, which likely have more storage, and have additional, LTE network-specific applications. But more likely than not, older "3G-only" SIMs will still be usable for a time, even in an LTE device on an LTE network. There will most likely be some legacy implementations built into the network to allow these older SIMs to work fine.

    Chances are, when the day comes that you get an LTE handset they'll swap out the SIM for a new one, like they tend to do now, though if you happen to keep yours, it probably shouldn't be a big deal unless there's some device incompatibility issue that crops up. And as people come in for various problems, they'll do their troubleshooting dance where the first they try is give you a new SIM... until eventually and gradually, the old SIMs are cycled out.

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