If someone gives me mobile with unwashed hands (e.x touched his/her genital before and didnt wash hands then), am i at higher risk of getting something?

Sure, but: Imagine what your world would look like if each person went to wash his hands before and after passing a phone to a friend to look at something on the screen. Imagine what this would look like at home, at work, at school, in the cafe's, on buses and subways. Life is not risk free, but can be miserable for those who worry too much... it's not the germs that will get them. Doctor can help.