Why is my iPhone 4 not activating after unlocking and updating it?

[mughal]

I unlocked iphone 4 that was at&t locked. But after unlocking it is not activating.plz help

 

[Just_Me_D]

Re: iphone not activating after updating

Reboot and try again. If that doesn't work, try restoring your device, and if that doesn't work, contact your wireless carrier.