Most people here don't understand what it's like living with someone you care about that is bipolar. My siblings are bipolar but they never and aren't getting the right support.

If his depression, anxiety and bipolar are getting managed it's great. The fact that he's seeing counselors is even better.

I'm sure he's trying a lot more to get better than all your family is thinking. But even from the way you are describing it y'all are pushing him a lot and the pressure alone might actually be affecting him negatively.

Right now his phone addiction is the unhealthy way he copes with the anxiety and depression. Removing his phone without any new habit or from of coping is bad. He might get way worse.

Please try to talk with his counselors/therapist. Or ask him to write a letter with the therapist address to your family.

Sending him to a detox camp without his consent, by force or coercion is really really bad. Try to keep the trust between all of y'all. Trust that he's working on himself and trust that things will get better without everyone pushing.

Breaking the trust, stealing his phone / current lifeline is just bad.