my iphone 3gs keeps saying no sim installed ! help me !

[majestic_10]

hey guys,
i just got my iphone 3gs a few days ago... and i tried to jailbreak it with blacksn0w and when i did, i restored it and now it keeps saying no sim installed, install sim to activated iphone. and i installed the sim but it still wont work
someone help me plz !

[ianbroste]

I'm unsure if you mean jailbreak using blackra1n or unlock using blacksn0w. If you are talking about unlocking it, ive read a common problem is you have to take the sim card out when you run blacksn0w