@.stu
Given the unstoppable rise of the mobile phone, telephone cleaners may be about to make a comeback.
How do you reach that conclusion?
A shared telephone may spread germs. Hence the need for telephone sanitizers. As more people get mobiles, fewer of them will be shared.
Your conclusion appears to be the opposite of reality.
Of course, if you were making a joke, it would have helped to use the appropriate icon so people didn't take you seriously.