iPhone 3GS cannot unlock for three UK!

[Gen2]

I've got an iPhone 3GS on 3.1.2. I did a fresh restore then unlocked it using blackra1n because I had a Three UK SIM card and needed to hacktivate it. Once that was done, I went ahead and downloaded blacksn0w and unlocked it. The problem is that there is only a 'No Signal' displayed in the top left corner. It is baseband 05.11.07 and I know that the SIM card is fine because it works in my friends iPhone the same way. It worked in this iPhone when I did it before, but I had to restore after a friend mucked with my iPhone.

Is there anything I can do? Any help would be appreciated. Thanks.

 

[kAoTiX]

Not sure with the baseband but recently had someone bring their 3GS into my shop and it was on 3.1.2 and was on '3'
It wasn't jailbroken though, all I can presume was that it was a factory unlock although the guy didnt know he just said he bought it off someone like that.

I should have checked the baseband out really but I would presume that if he had 3.1.2 he would be on the latest baseband as well. But cannot confirm.

 

[Moi un Mouton]

No signal or "No service"?

When i first put a T-mo SIM in after unlocking, it showed "No Service" for a minute or two, then connected and it was fine.

 

[Gen2]

It's not temporary. It's permanently at no signal and I remember I dd something really stupid that made it work last time. Something like restoring to a custom ipsw, activating it with an O2 SIM card, then using blackra1n+blacksn0w and it worked right away. Thanks though.