From CNET:

Disinfect your phone: Wipes, not pure alcohol

amsung added to its website you can use an alcohol-based solution (70%) and apply it to your phone with a microfiber cloth.

 

Some websites suggest creating a mix of alcohol and water yourself, but it’s crucial to get the concentration right. Get it wrong and you could damage your phone. The safest bet is to use disinfectant wipes that contain 70% isopropyl alcohol to clean your phone screen.

 

Another option for day-to-day cleaning is investing in a UV light, such as PhoneSoap. This UV light company claims to kill 99.99% of germs and banishes bacteria. As far as we know, it hasn’t been tested in relation to this strain of coronavirus.