will not spread through inanimate objects and also nail scratch.
Other than sexual contact, blood transfusion
, needle sharing and from an infected mother to her child during pregnancy
, labor, breast feeding, the chances of HIV transmission is almost negligible. Occupational exposures have a low risk for the health care workers who handle blood, soiled instruments without adequate precautions..
So playing with others mobile phone is not at all a risk for your child. Forget about this and relax.