ChangeWave: 31% of iPhone owners likely to switch to Verizon

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.

Asked how likely they would be to switch carriers if Apple (aapl) made an iPhone for Verizon (vz), 18% chose "somewhat likely" and 13% "very likely."

And this is from respondents who already own an iPhone. Complaints about AT&T (t) were the No. 1 and No. 2 things iPhone 4 owners said they disliked about the device in the Aug. 4 survey. See here.

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.<!-- more -->

See also:

[Follow Philip Elmer-DeWitt on Twitter @philiped]

All products and services featured are based solely on editorial selection. FORTUNE may receive compensation for some links to products and services on this website.

Quotes delayed at least 15 minutes. Market data provided by Interactive Data. ETF and Mutual Fund data provided by Morningstar, Inc. Dow Jones Terms & Conditions: S&P Index data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. Terms & Conditions. Powered and implemented by Interactive Data Managed Solutions