bricked and locked

Hi

This is kind of a long story and I am hoping someone will be able to assist me. I got an iPhone 3gs from the states last year. I had the phone jailbroken and the network removed.

Last week sometime my phone gave me a sync to iTunes message to continue.
After messing around with the phone for over a week I accidentally updated the phone to version 4.1. Now when I try to sync the phone it needs the simcard (think it was AT&T) to activate.

I no longer or have access to an AT&T cellphone. Could someone please advise me how I can go about firstly activating the phone and secondly remove the network lock.

Thanks in advance

 

thanks a lot. I have sort of made progress lol

 

thanks a lot. I have sort of made progress. Somewhat hehe. The phone has been jailbroken and I can use it. But I still need to remove the network lock.