I wonder if anyone can help with this. The past few days on several occasions when people have tried to phone me it has gone straight to answer phone even though I have full signal. It doesn't show up as a missed call and I'm not getting an answer machine notification even if they leave a message. I also can't seem to make a call. If I switch my phone on and off again it seems to work for a while then the same thing happens again. Only had the phone a month, on a Tesco plan and I think they use O2 signal? Is it likely to be a problem with the 3G signal, the mobile network or my phone? Not very techy minded so no real idea where to look for help!