If 13% of US wireless customers consider their service excellent and only 15% of US mobile users use mobile Web . . . Why are carriers spending all of their money on applications we are not going to use? Voice is still the killer application and only we only have 69% market penetration in the US or 207.9 mln wireless users. 54.1 mln Americans use Cingular, 51.3 mln - Verizon.