Hey guys! I have found a good deal on an iPhone 4 with a no signal fault on eBay. I'm thinking of buying it so I can repair the antenna in it. I heard this issue is caused by a loose antenna cable in the phone, or even a software bug. Is that all it can be caused by? If so, I could probably fix it my self. What else can no signal be caused by? Thanks! PS: Its only 80 pounds so its not too much if it goes wrong as I could use with an iPod Touch anyway.