pass for/as (someone or something)
to succeed in being accepted as someone or something
The young woman was trying to pass for a reporter when she went to the concert.
The man was passing as someone who knew more than he did.
Precautions while using Mobile Phones
Minimal reduction of exposure
If you must carry your cell phone on you, it is preferable that the keypad is positioned toward your body and the back is positioned toward the outside of your body. Depending on the thickness of the phone this may provide a minimal reduction of exposure.