How to unlock i55oo -

SAMSUNG GALAXY S 2. CERAMIC WHITE. 16gb. (VODAFONE)
Hi I am selling a Galaxy S2 in ceramic white with 16gb internal memory. I have had this phone for approximately three weeks. It is an upgrade phone from Vodafone. The phone is in excellent condition with no marks, scuffs or scratches on the body or screen. I have a hard plastic case fitted on the phone, which will go with the phone. All accessories will be provided with the phone. Instruction manual, ear phones, extra ear phone covers and a micro sim converter. The box is also in excellent condition. I am selling the phone because I dont like the Android platform. Its too complicated for me. It is a very fast phone when it comes to browsing the web. The screen is amazingly clear. I will go back to using the iphone again because its idiot proof. I am happy to show you the phone first, take a good look at it and try the features first. I would like a quick sale with no returns as I could do with the extra cash. If you are interested you can phone or text me on 07803300220. Unfortunately I havent had the time to take pictures. I have been told its very simple to unlock these phones so you can use it on any network.