Do all ATT SIM cards work on any Iphone 4?

[tangytangojuice]

So, i bought an iPhone 4 from a guy on ebay, but it is still a locked iphone. I accidentally upgraded it to 4.3.5 so my baseband turned to 04.11.01, which is not unlockable by ultrasn0w. But, my friend was able to jailbreak it in a way, where it is kind of jailbroken, but i do not have cydia, but I am able to just put in my ATT GoPhone Sim card, and it works. Do all Att SIM cards just work if you put it in an iphone 4? Could I upgrade my phone onto ios 5, from itunes and just put in my sim card and works?

Thanks.

 

[gh0001]

you don't need to unlock the phone if you just want to use it on AT&T (assuming it is an AT&T iphone to begin with). you only need to unlock it if you want to use it on, say, T-mobile, or a foreign operator.

for the same reason, you should be able to just upgrade to iphone 5 and use it on AT&T.

 

[tangytangojuice]

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But I have a goPhone sim card, not a sim card for the regular post paid att plans. Will it still activate?

 

[hexonxonx]

Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_5 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8L1 Safari/6533.18.5)

But I have a goPhone sim card, not a sim card for the regular post paid att plans. Will it still activate?

Yes. An AT&T sim is an AT&T sim regardless if it is pre-paid or not.

 

[tangytangojuice]

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So during the iOS 5 activation I just leave my sim card in and activate it.