Just replace a broken screen on the ip4, after putting it all back together I also got "no service" after reading this forum I found that I had not attached that tiny wire that comes off the speaker housing. It is very tricky to reattach it, but after 10 mins of gentle manipulation it went back on. It doesnt snap on it kinda just sits on top of the hole. The place it needs to go is right next to the screw hole just beneath where the battery plugs in. Hope this helps