These pictures show the hidden life on your phone – the bacteria that lurk on your mobile.
Long after we’ve swiped and tapped our smart phones, or sent and received texts, our devices retain a biological history of our actions.
Students studying bacteriology at the University of Surrey imprinted their mobile phones on to Petri dishes to see what they might carry.
Although the results after just three days looked pretty grim, thankfully most of the bacteria were harmless - nevertheless, it just shows the invisible life that can lurk on your phones.
Some disease-carrying bacteria were occasionally found, such as Staphylococcus aureus - a common cause of Staph infections including food poisoning, impetigo and even septicaemia.