Now a days Android and the other smart phone OS's growth makes the higher mobile internet traffic rate. So it's neccessary to have a link inside your blog to switch to the Mobile blog so that it can be easier to get more mobile readers as well as for mobile SEO.
There are no more hidden magics. just a line of code is enough for this. just find the code below and give it inside your Blog's html code(the place,where you want to show the link).
<a href='http://jeshmal4u.blogspot.com?m=1'>MOBILE SITE</a>
(replace the URL with your blog's URL,or else i will enjoy the link)
That's it.. now you can trial it from your mobile browser.