According to a piece featured on Fox 2 Detroit, the companies with the lowest number of complaints in the industry were Verizon, Nextel and CINGULAR. For those of you with streaming video access :

mms://streaming.vmsnews.com/media/INSIGHT/200 40812-504839-DE60D61A-BD5A-4A0D-94E4-9688503B 790F.wsx

This comes from the FCC!