If you are using an iPhone, these changes will not effect you. I use a different device detection for iPhones.
If you are using any other phone, please visit this link on your phone...
http://www.thismachine.info/
And post "Your full setup details (your 'user agent string'):"
Something like this...
Mozilla/5.0 (BlackBerry; U; BlackBerry 9700; en-US) AppleWebKit/534.8+ (KHTML, like Gecko) Version/6.0.0.499 Mobile Safari/534.8+