apple iphone 3g 8gb slight fault working. look cheap +

i have a iphone 3g 8gb. slightly faulty. all works great and shows network and signal (see pics) but wont call out comes with usb sync lead (no charging block) screen in great condition and back has scuffing but no cracks. have been told that unlocking will sort it. got iphone 4 now so not bothered with it. works great as ipod touch. or unlock it to get a great phone £70