Thanks for your feedback. I can confirm that our Mobile Mode doesn't work with the BlackBerry 5 OS browser. vBulletin, the software provider, is aware of this issue (
[#VBIV-11004] Mobile Style - Lack of support for BlackBerry Browsers and other non 'WebKit' browsers - vBulletin JIRA) and I'm hoping that it will be addressed soon. For BlackBerry users who wish to use the Mobile Mode, you will need to use the Opera browser. I do realise that this is not an option for some, and apologise.
Mobile Mode should work on all other smart phones including the iPhone, Andriod and Symbian devices.
I'd also like to thank
anat0l and
NM for the assistance they provided in identifying the issues.