Hi Phil, when you say it no longer works on your smartphone, do you get an error message? If you’re able to give us the website or article URL, we’ll be happy to take a look.
The mobile app works a little differently to the web app due to limitations on the Android platform. So you might not always get the same results as our desktop browser extension - depending on the website you’re trying to send the article from.
You can, however, run our bookmarklet on mobile which will produce similar results to the web app. We have setup instructions for that here: Push to Kindle bookmarklet - FiveFilters.org