I've had my 3G phone for about 8 months and worked fine up until Tuesday this week. Now I cannot call out or get calls. When I go to make a call, the phone attempts to call, but then quickly - after one ring - tyhe screen switches to say "Call Failed". Same thing for someone calling me - I hear 1/2 a ring, and it goes to missed calls. Half of my incoming "missed" calls show up as being from "unknown" even though I know they were from people in my contacts list. I can text just fine, read email, use the camera and safari. Only the phone feature seems to be messed up. Any suggestions?