https://play.google.com/store/apps/d...lters.kindleit
For sending a webpage article to your Kindle device of choice, using the phone/tablet browser's Share function.
This works reliably for me, as does FiveFilters' companion Google Extension. Occasionally, it detects a page that it can't send properly, so it gives you a "PastePad" blank input form into which you can copy-paste the article and hit Send.