I wouldn't say I was addicted to Phone to start with as my job involved interacting with phone all the time, but after I had to shutdown my startup due to health issues I made some deliberate lifestyle changes which has reduced my phone interactions to negligible levels/day and some of which can help overcome phone addiction too.
• Notifications
I have a smartwatch mounted to my desk[1] which displays notifications as an when it arrives and since most of the notifications doesn't require urgent action; interaction with the phone can be avoided. Of course this can work with smartwatch on the wrist too, but having it mounted on the desk limits interaction with the watch itself.
• More email
My primary mode of professional communication has been email for past two years. No voice calls, No chats, No video calls just email. Avoiding real time communication has improved the quality of communication and my mental well-being in general by reducing anxiety.
It does cost me several business opportunities, 'Sorry, I don't do calls, can we communicate via email' has become downright insulting especially during this era of 'Zoom'. But that's the price I'm willing to pay for better mental health.
Fortunately email remains the last pillar against 'Mobile First' ecosystem and environment amidst several attempts to change it.
When the availability of a smartphone is taken for granted from education[2] to COVID-Free Passport, using cellular connectivity is passively mandated (Mobile Number for unique identity, OTP[3]) I don't think it's even possible to someone to throw away their phone without some serious regulations mandating that freedom.
[1]https://abishekmuthian.com/butt-pomodoro-a-butt-triggered-po... (A project which shows the said desk mounted smartwatch).
[2]https://needgap.com/problems/149-remote-education-for-underp... (How the availability of smartphone, taken for granted has affected education - Disclaimer: It's my problem validation platform).
[3]https://twitter.com/heavyinfo/status/1343461028256833538 (My tweet thread discussing mobile number for identity).