I would think that as we are talkd 'drivers' here
it is essentially in or out not 'switchable'
However I understand your need I believe and two things come to mind.
1. If it is external- then have it placed so it can be switched off or unplugged [especially if it is USB]
2.If it is internal then have the phone lead in an adaptor near the keyboard/ screen so the Phone line can be unplugged at will.