Designing for browsers but not for devices ?

It’s fairly safe to assume that most people are designing their websites for the popular browsers (IE, Chrome, Firefox and Safari), however looking around, its still evident that people are not designing for mobile.

The reality is more people probably visit your website on a mobile device than on all but one of these popular browsers (and yes you’ve guessed it that’s Internet Explorer)
For 21% of site traffic over the last month was from mobile devices, only 16% of traffic was from someone using Chrome.

The third most popular browser version on - after IE9 and IE8 is the Safari on IOS5.

while your working out if you need a mobile app or site, 1/5 of your potential site visitors are walking away - or worse phoning your call centre.