The title of this article has absolutly nothing to do with the content of the article, you didn't answer the two basic questions the title suggests you would answer, "How to buy a phone" and "How to set up 3G/4G", 3G and 4G are no where mentioned even in the content.
Keep up the good work and misleading article titles like all mainstream media.
Touche!
you'll note this, the last line of the article:
To read the full article, go over to our sister website beijingkids.
where you will much of the detail you are looking for