Hi Thanks in advance for your help. 

Im trying to get my iphone 4 unlocked which was on ATT.  They are having some issues with IMEI number.  What happened was I had an Iphone 4 which was replaced under warrenty by apple for battery issues during my contract with att.  Unfortunatley the new phone has a different IMEI number that the original phone.  I got the replacement phone in July 2011 and my contract ended october 2011.  I would really appreciate your help.