3G will not work with AT&T sim after software update

[Mustang5L5]

I've tried to solve this issue for a few days now.

Sister gave me an iPhone 3G which she stated she went to AT&T and had them unlock for her so she could use her t mobile sim card. She's not the type to mod an iPhone, so I can't dispute her claim to this....but anyway she used it for 4 months like this

She gives it to me. I take sim card out of my razr, put in iPhone and all is well. It was running firmware 3.1.3 I believe

Stupid me plugs the phone into computer and updates. Now I am stuck at the activation screen. I put my sim card in and doesn't work.

I jailbreak it using redsnow to 4.2.1 and try it again and my sim doesn't work.


I go to AT&T and get a new sim card and change my number to that one. Put in iPhone and doesn't work, put back in my razr and it does work fine.

Do a dfu restore to 4.2.1 and back at activation screen. Try to activate in itunes and it says sim not supported.

I re jailbreak using redsnow and leave the new sim card in....same deal.

I have no service and it says carrier unavailable.

I'm running firmware 4.2.1 and bb 5.15.04. I do not want to do the unlock to 6.15.00 if I don't have to. I am an AT&T customer and just want to activate a hand-me down phone

[iYeow]

If this is an ATNT iphone, then without any jailbreak, it should work.

[Mustang5L5]

Ugh, could this possibly be a block IMEI phone?

I don't know it's history, but it's been passed through a few hands before I got it. So who knows if it's a legi or not.

Ugh now I don't want it. I guess I can call AT&T and find out for sure.

[CaptainChaos]

There is no way that AT&T unlocked it. They do not, ever, unlock iPhones. More than likely someone at the store Jailbroke it and then unlocked it.

[Poseidon79]

Sim not supported is only displayed when you are using a sim card from a carrierk otherm than the original. If an AT&T sim doesn't work that means the phone came from a diff country and you MUST unlock to use it.

[CaptainChaos]

What is the model number?

[Mustang5L5]

Someone possibly could have jb and unlocked it. I don't know. Lets just say it was unlocked somehow.... my sis was using it on t mobile, and she is not very tech savvy.

I however, am tech savvy, and yet 1 hour after getting the phone, I let it update. Stupid me, I know. Should have read before I did anything

Anyway, model number is MB489B
Fw jb'ed. 4.2.1
Bb 5.15.04
Bootloader. 6.4

Did some searching......is this a UK phone?

So now what are my options? Pretty much back to using my razr now

[Poseidon79]

I vote you update the BB and unlock with ultrasn0w. Again.. If iTunes is saying an AT&T sim is not supported then the only conclusion is it's from a diff country.

[Mustang5L5]

Starting to look that way. Guess that is my only option at this point