for the last week or so I have been having a lot of trouble making and receiving calls, mostly when I'm at home. I will sometimes get a text saying I have a missed call and my phone has been next to me and not rung. When I try to make a call it just disconnects within a second or two. I send texts and sometimes they get there straight away, sometimes in a few hours and some times not at all. I cant even ring 150 to report it !!