apple iphone 4 16 gb wanting £300 but open to offers +

this is my iPhone 4 for sale due to having an iPhone 4s i only had the phone for a short time before i got my new phone! its in great condition as its only been used a handful of times. comes with a charger and box if i can find the box out.(locked to t-mobile but can easily be open to any network for like £15) pay pal or cash on collection