Our generation uses mobile phones and smartphones for work, college, making phone calls, reminders, sending messages, emails, music, photographs, games and the internet. Over 80% of the world citizens are in a possession of mobile phones.
With how attached people have become to their mobile phones or smartphones, it’s not a surprise that what we touch ends up on the screen. It’s what exactly ends up there that’s the real shocker.
Researchers from UW-Milwaukee’s Microbiology department tested heavily used mobile phones.
The tests found traces of E. coli and other coliforms. Coliforms are a bacteria indicating fecal contamination. They found between about 2,700 and 4,200 units of coliform bacteria on 8 phones.
FoodWorld 
I have found large TVC readings on the odd occasion whilst conducting swab checks of food production area telephone touch keys and computer keyboards during food safety audits and suggest businesses should check that their cleaning and disinfection schedules include these items.