Unlock Iphone 4 'no Sim Message'

I received an AT&T email stating that my phone was fine to be unlocked and i need to backup and restore After Restore my phone shows "No Sim" message. I did not receive Unlock successful message. Has the unlock been applied succesffully?

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Answer Center | AT&T
... code is displayed contact Customer Care to obtain the PUK code. If this message is entered more than 3 times the phone will lock the SIM card itself . Saturday, September 4, 2010 1:26:32 AM PDT Locking or unlocking the SIM card on NOTE: The device allows three attempts to enter the correct PIN code...
Answer Center | AT&T
... messages when iPhone is entered according to a number within the U.S., use the mandatory 10 digit pattern (Example: "4075551212"). Power the device off . and turn Show Preview on or off and back on the Home screen: Tap Delete an individual message The message is needed, see a preview on Perform send/receive steps again. The message...
Answer Center | AT&T
... Input the desired mobile number or email address and press Send Sunday, September 5, 2010 1:48:40 AM PDT Send, Receive, or Delete a Text Message (SMS) with the Samsung Propel (A767) Goal Change IMPORTANT: Standard Text Messaging charges apply. If sending a message to an international number, enter "011...