This is driving me batty..... I have a samsung infuse and the att microcell. With FIVE FULL BARS I have to send the same text message 2 to 5 times to get it to go through. I have seen others have this issue so I am not sure if its the phone, the MC or both.
Any solution before I throw both out the window !~~
I see this is old, but did you ever figure out what the cause was? I had the same issue, seems intermitten to me, but I also think it had to do with my TEXT+ app... Post back if you found a cause and working solution.