I’ve had service with just about every company you can think of and i rank them as follows…
Verizon
Cingular
Tmobil
Nextel
Sprint
AT&T
Cricket
For Verizon customers you know you can update your phone about once a month right? Apparantly it refreshes your phone to all of the new or updated signals or something like that. Dial *228 it will automaticly re-program your phone. I went about an hour 3 or 4 times where I had no service and could not send/recieve texts and after I do the reprogram thing it started working again.