The phone companies may be regulated as public utilities but most of my friends don't use the phone company's voice services anymore. Instead they call on Facebook Messenger or Line or WhatsApp which are not regulated as public utilities.
I don't know where to draw the line. Kicking them off say youtube? Maybe. Kicking them off the entire internet? I'm not so sure. Allowing them to stay on the internet (if you agree banning them from the internet is going too far) requires some companies to carry their content.