ChangeWave: 31% of iPhone owners likely to switch to VerizonAugust 13, 2010: 5:46 PM ET
Trouble ahead for AT&T if Apple does make an iPhone for Verizon
Here's a little bar graph that didn't make it into ChangeWave Research's Aug. 4 report about customer satisfaction with the iPhone 4.
Rumors of a Verizon iPhone, which have been kicking around for years, have heated up in recent weeks, with speculation centered around January 2011.
UPDATE: A Morpace Omnibus Report based on a survey of 1,000 consumers July 15-20 got similar results. See their bar graph below.
[Follow Philip Elmer-DeWitt on Twitter @philiped]