As you know, millions of people use their mobile phones to access internet. The mobile internet speed is also very fast these days with 3G's , mobile apps,etc.
From this, we can say many of your readers are coming to your blog through mobile phones..But, if you don't make your blog mobile friendly, .you may lose all your mobile readers because in a mobile phone, a normal blog takes lot of time to load and there are other issues that your site not fitting properly in the mobile screen.
So, here is how to make your Blogger (blogspot) blog mobile internet friendly..
<b:include data='blog' name='all-head-content'/>
3 .Now after this line add the following code -
<meta content='IE=EmulateIE7' http-equiv='X-UA-Compatible'/>
<meta content='width=device-width, initial-scale=1.0, user-scalable=0' name='viewport'/>
<meta content='width=1100' name='viewport'/>
Now click Save Template
4. That’s all, now your blog is mobile compatible and will load faster for mobile users.