I have an entrenched Anki habit – I picked it up while studying for an exam, and now it says I’ve been using it for an average of 17 minutes a day for 2 years. It’s a great tool and I recommend it. But I don’t think it helps to fix the phone addiction problem. Getting to an average of 17 minutes was hard work that required a lot of willpower. I’m sure most people with a phone addiction problem are spending much more than 17 minutes a day on unproductive scrolling.