iphone 3G 8GB BLACK for spares, no signal !

For sale is my iPhone 3G 8GB good cosmetic condition ... has been a brilliant phone well looked after by my wife. Main issue is that since jailbreaking on iOS 4.2.1 there is no GSM signal, hence the low price....Wifi/internet works fine, all other buttons are fine. Best to use it as an iPod, or fix it if you can...might be an easy fix! Comes with usb cable. Cash on collection only,thanks.