Apple iPhone 3GS 16GB ?

Selling my IPhone 3GS- 16 GB in a good condition no marks on screen. i am selling my iphone coz i have new samsung galaxy upgrade. Using all networks Unlocked very nice black color. comes with the charger. excellent phone with still screen protector on. slight wear and tear of use. Cash on collection any where in london or pickup from Marble Arch thanks for more information and details please txt or ring 07529489110. thanks.