Before you deactivate a customers connection for whatever reason (unpaid bills, contract cancelled or what have you..) send them a message of some kind so they can take immediate action. A SMS, email or some sort of notification in the self serve app or account would be really helpful. Don't just wait for them to discover that by accident three weeks later when the once-a-month phone call home is due. Or a potential future employer has to write an email to tell you that they can't call you. Which is pretty embarrassing. Thank you.