He needs to be moved to a different group home. Since it appears to be a home for adults only, they are allowed to have phones without permission of the staff but it's usually heavily regulated. If nobody is monitoring his usage then it means nobody is doing their job, and if they can't handle the most basic of tasks in doing this, then I can't imagine what's going on in there. They seem to be content with letting him act like a degen.
Group homes are often abusive and/or neglectful in some form, so it's not off the table. I wouldn't be surprised if his ramblings ended up being true. Not saying I feel sorry for the pud, but I do feel sorry for the other residents involved.