Is it possible to update blog from mobile or Smartphone ?

To be precise, you can't do every task,  a blogger do, from mobile or Smartphone.

Why Not From Smartphone ?? 

Your question is accurate and acceptable. So I think its valid to answer your question.

Some of the task will be simpler to do from Smartphone, like typing in any language, checking Adsence earning from your mobile etc. But if you like to work as a professional blogger and want to edit a picture and other task then you will surely need a laptop or a computer.

Like this there are many such tasks which you can't complete without your laptop or computer. For example :

1. If you want to customize your blog or you want o edit the template or theme then it's not possible to do this task from Smartphone.
2. As I discussed above you can't create image according to your needs.
3. You can write a good looking article with your Smartphone.
4. You can't write a SEO optimized article as will require a keyword search tool and to place them in article.

So it is our advise to write article on PC so that you can get Success in your blogging career.