Hello,
I have an 8700 with os 4.5. I too have been between GSM, GPRS and edge. I've called t-mo, but the CSRs are useless. This started three weeks ago but for some odd reason it has gotten better. Ohhh, I forgot to mention that I live in Philly. I am also looking for answers and found that rebooting helps. Its getting old though. Thank You.
~via smartphone mobile.rabroad.com~