I sent in my HTC One black after 3 days because of this problem [see this thread: [Sprint] Anyone with a death grip reception problem?
] with very bad reception. After a week i got a brand new one. Same problem. Now i will call them again. This is just sad.
Another wierd thing is when ever i make a call and from the time i press the call button, the signal goes up to full. And as soon as the call is over the signal drops down to 1 or no lines. There it stays. During the call the signal is just fine and there is no problems with the quality and sound of the call. Is it a software issue or some kind of power saving?