blog not iPhone friendly

Hi folks.

I’ve just been contacted by a subscriber who alerted me to the fact that he can no longer access the comments thread he is subscribed to on his iPhone.

I recently migrated my blog to its own URL, and prior to that changed the theme to the Twenty Eleven theme. This subscriber said he had been able to read the comments thread on his iPhone with the older theme, and the current one. It seems his issues accessing the comments thread have occurred coinciding with the location migration. As far as I know, in all other ways the blog is functioning perfectly.

Does anyone have any suggestions on how I might identify any issues that will enable me to restore my blog to the mobile-friendly status it apparently had prior to the migration?

The comments thread URL can be found at this post location:
http://www.boomtownrap.com/62/avatar-my-arse/

Cheers