Quickest, cheapest way to unlock an iPhone?

I just sold my Orange network iPhone 4 on eBay. I scanned the barcode & the spec said it was unlocked but the buyer says its not working and would like it sorted. I have the serial number and IMEI number… Can someone recommend any legitimate websites that unlock the handset or whether my provider can do anything without sending the handset away. I have no idea how these things work, so any advice / rough prices would be very helpful As soon as possible.

The quickest and cheapest way to unlock an iPhone 4 is by using Online sites. Because service Provider will take more time/month to send you the code.
I would suggest the site http://www.unlock-zone.com/apple-iphone-4/rs16wp9/ here they are Remote Unlocking Service at low cost. Using that service you can unlock your phone permanently. After unlocking it from Orange network, you can use freely any GSM network SIM card. This is the easy, safe, fast and permanent unlocking method. I have unlocked my iPhone 4 here.

Note: Here, they are providing this service only for iPhone 4 locked with Orange Israel network.

Ring orange tell them you want your phone unlocked. They will ask you a few details. And they will do it for you. Soon as you get a text from orange sayin it's done. Sync the phone to iTunes back it up. A message box will come up saying congrats your iPhone is now unlocked. If its contract it will be free

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