Hi,
You can unlock your iPhone using remote unlocking method.By using this method you can easily unlock your phone within a short period .I have unlocked my Iphone by this method only through this site
www.theunlockspot.com/apple-iphone-4/rs10wp9/ within 1 to 4 working days.To get Remote unlock i specified my mobile IMEI number,country name and network provider to which it is locked and unlocked my phone remotely.You can also use this site for unlocking your Iphone .