That would be a great idea...give him a monitored phone...lay it right there next to him....kids are so addicted to texting he won’t be able to resist....then see who he contacts...etc.etc.etc.
There’s a low tech method to help him get his voice back but maybe at an octave or two higher. Heck get a Union thug to administer that therapy-—no shortage of them in Dem infested New England.