When my nephew went off to college a few years ago, he became "unavailable". He wouldn't answer his cellphone or return calls from his mom. So, she established that there would be no money deposited in his bank account until after a phone call. So....no phone call, no money. After a couple of times of finding out that his debit card was "dry" after a "dry spell" of telephoning, he managed to force himself to call home once a week.