I'm not sure about rehab, was responding to ? about phone easiest for you would be to keep it turned on - it's worth the peace of mind...
However if your son is like my X as far as losing things you might want to try what we did. X worked out of state would lose phones, phone cards, collect calls cost fortune besides him calling at 3am was a pain.
I got a beeper/message service with a 1-800 number surprisingly it only cost me about $10 a month (though was years ago). It worked great for us I could leave messages to him on outgoing message, he could call and leave "daddy" messages to kids at 3am without waking them. We didn't talk directly to each other (saved lots of screaming matches) and it gave me a way to pre screen what he was saying to my kids.
It might be an option to consider with kids who constantly lose their phones or don't call to check in because don't want to have conversation or call at designated time. It would also be a way for parents to have time to think of a good response, rather then winging it when they call with their drama.
Nancy
