ok, so it was fine before, i figure i was one of the lucky ones, no dropped calls, no unusual 3G/EDGE behavior, picked up the signals fine wherever they're available (i live in NYC). Updated last night and NOW i'm getting "call failed" and dropped calls. This SUCKS. I'm gonna ignore it for a while and see if it straightens itself out. if not im gonna be pissed.
p.s. updating took about 20 minutes. i don't think i needed to back anything up. that seemed to go smoothly.
I was also getting the dreaded "Call Failed" message. I turned 3G off in preferences and I can send and receive calls again. A temporary solution at best.