Angry [Q] Can't call or data but SMS works..strange

my unlocked s-off vzw m7 won't do calls. when i place a call it goes "..errr.. ber ber ber...beeeep" and hangs up; nobody can call me either. spent 10hrs with verizon trying to fix it but they got nothing. Data, 4g/whatever, does not work. SMS and MMS work fine. Push works fine. Wifi works fine.

i've tried different roms, kernels and radios but nothing. one night it worked fine, next morning it was no good. can't think of anything that would have changed.

anyone? it's so strange...