Not recieving calls

[smknSRT8]

Anyone else have a friend tell you "Yo I called you like 5 times where were you". This is starting to bother me especially now that school started and I am trying to plan my nights and I can't receive calls!!
It is not like 1 or 2, I am talk yesterday alone, a total of 25 calls that I never got. I have a V1, so not a 3G related issue. Since I I now like an hour away from an Apple store, I am going to have talk to ATT while I go to the mall. I am hoping they will have something to tell me.