I recently acquired a used Iphone 3GS from a friend, who said it worked fine. And it does, but it won't hold a charge. While it's plugged in, it works great, but when I unplug it, the battery dies within minutes, sometimes seconds. If I don't use the phone at all while it's unplugged, it'll stay on for the normal amount of time. But if I try to do anything, play games, use the internet, call, text, etc. The battery dies, and it won't turn on again until I plug it back in. The battery says it has full charge. Does anyone know of a way to fix this? Thanks.
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