Sim Card not getting Detected on iPhone

[Shaan12]

Okay I am using an iPhone 1.02. I got this phone from US. And have unlocked it. I had done a restore on my phone and since then it doesn't recognize my sim card. It gives an error saying that Sim Card is not an AT&T card. But when I got it at that time it was unlocked and was working fine. But due to sound problems while calling I had to restore it.
Can some one please suggest any solution.

[Quentin]

So, obviously, the phone was unlocked in the US, but with your action you deleted the unlock. Now apple has control again , so you need a new way to work around that, say get other sim cards working.
And of course, with your restore, you restored original settings. And because apple doesn't want you to use other providers than AT&T, nothing else is working.
So now try to get any other working sim cards.

[Shaan12]

So there is nothing i can do? Now with the different resources the phone is going on and off.
I can get the yellow triangle back, but do not now what to do.
I have tried to restore 1.02 and jailbreak. But jailbreak crashes or cant find the firmware. In the downloaded 1.02 files.
And I don't know anymore what itunes to use.
Please can some one suggest any more suggestions.?

[Simond]

I can only suggest a few things to solve this problem as I myself haven't been through any problem like this. I would reset/delete everything and start new. Maybe you can find out something about the firmware version used and from that you can go on. Look for a new workaround and then everything should be fine.