what is a 100percent way to check if a android phone is being bugged?

How can you scan a android phone to tell if its bugged?
Beside taking the phone to the ATT store and having it wipes and reinstalled. Is there any other way?

Anti virus program or a specific program set up to scan android phone

on top of that how about your computer beside normal anti virus is there a third part way to scan it? like if something was written into the windows software its self?