Urgent Samsung S3, White, Excellent condition, swap for I phone 4s 32gb unlocked. ?

Have a mint condition Samsung Galaxy S3 in marble white for sale. Have had it for a few months but hardly used and kept as good as new. Has 16GB of internal memory and will be supplied with a 2GB micro sd card. It is on o2 network and may be unlocked as Tesco Sim has worked, and other networks appear in Network settings. Screen protector on it since new. Selling on behalf of my son who needs to get ready for GCSEs as it will cause too many distractions. Will also be supplied with 3 cases as pictured, charger (mains plug and cable) and original box. Cash on collection only please. No traders or timewasters. Very near offers will be considered or swap for a *new or as new condition white iphone 4s 32gb!!! unlockedor on 02* Serious buyers only and no scammers! Genuine seller not a dealer. Thank you for viewing ad :)