The reading mode available on iPhone can be used automatically so that every web article you open on Safari will strip it down of unwanted stuff like autoplaying videos and ads.
For many years, Safari had a so called reading mode, that you can easily enable by holding down the aA button on its address bar. But, there is an option to always make Safari load articles in this reading mode.
How to automatically use Reading Mode
You’ll find this option in the Settings app. Go to Safari settings and scroll all the way down.
Now enter Reader section and toggle the only option available there to use it automatically on every website.
Now that you enabled the option, just enjoy peaceful reading on your iPhone.
After loading, every page that contains an article will automatically enter Reader Mode, with clean black text on white background.