With WordPress 3.2.1 & WP_Touch 1.9.35 iPhone users can't reach my website at all. Instead they get a message 'Could not open page. Safari can not open the page because too many redirects occurred.'
Disabling WP-Touch fixed the problem. I already looked into DNS, and all kinds of other possible problems that were not it. I could hardly believe that WP-Touch is the prob, but there you have it.
Enabling WP-Touch Restricted Mode, did not fix it. Enabling '1st visit mobile users will see desktop theme' fixed the problem, until users turn the mobile them back on from the bottom of their iOS Safari page. Then it is broken again. Have to disable WP-Touch. Waiting for upgrade.
Probably unrelated: The other major problem I've been having is that something in my WP site using way too much ram, causing the host to terminate my processes, which also kills the website. Could also be WP-Touch? I dunno.