Can Apple tell if my Iphone 4 has been Jailbreak? Having a lot of trouble with our iphone 4, both phones, my and my wife`s shows one and two, sometimes three bars and they will not make, or receive a call. Where I live is a weak signal area, but these phone just plain sucks compared to our old iphone 3G when it comes to making and receiving calls. Before with my old 3g phone, if it showed any signal at all, they worked. Both 4.0.1 updates. Love the phones when they work, and thought they would get better, but starting to get old with with a phone I cant make a call on. thought I might return both, and get replacement phones. Lots of people claim to have great reception with their iphone 4. We ordered our the second week, maybe we got a couple bad phones.