I'm on AT&T in a pretty AT&T heavy area. I know that they network has its issues, but the Torch has given me the most reliable connection. Maybe you can get your Torch checked out at a service center...
Sometime, i have noticed drop calls instances more frequently when hybrid OS is installed compare to official/leaked OS. I have noticed several instances immediately after installing hybrid, frequency of call drops increases and when i revert back to original base OS, it goes off..
I'm on AT&T and sometimes I have that dropped call issue, but not a whole lot to make me irritated. It's definitely a carrier thing, but when I had my iPhone it was 10x worse!
OP is the cell signal weak in your area? You might try going into the local AT&T shop, tell them your tale of woe, mention you heard about something called a "3G microcell" and ask if it would help. Maybe they'll give you one for free. ...Assuming you have Cable/DSL internet at home, that is.