A lot of people use mobile phones to browse web, so it is very neccesary to have mobile version of your blog.
Blog gaint blogger now provide the mobile version of their blog, so that visitors are automatically redirected.
but this feature currently in Draft and for limited number of templates.
follow belows steps:
1. Setting
2. Email & mobile.
3. enable 'YES' on mobile device, show the mobile version of my templates.
4. Save
You can also view a simplified version of your blog, by just add ?m=1 to URL.