3 Ways to See Text Messages from Another Phone without Them Knowing. With the increase of smartphone use since 2009, sexting among kids aged 12-17 also increased. About 14.8% of the surveyed children said they sent sexts at least once, and about 27.4% received them. So, how can you know if your child has a problem? One of the proven ways is to learn all about reading texts from another phone. In this article, we share three methods to intercept text messages from your kid’s device without violating their privacy.