Absolutely not! This is likely one of the top misconceptions in today’s smart-phone reliance world. Private Investigators cannot get into anyone’s phone and access their text messages or deleted messages. This is highly illegal, and it is illegal for you to do so too unless you happen to own the phone you let them use. If the phone does not belong to you, then you need to stay out of it no matter what may be in the phone. Infidelity is almost always discovered by other means.