Not true. When a person speaks in tongues, he is speaking to God (1 Cor 14:2), he is speaking the wonderful works of God (Acts 2:11), he is magnifying God (Acts 10:46), he is giving thanks well (1 Cor 14:17), he is edifying himself (1 Cor 14:4), he is praying in the spirit (1 Cor 14:14-15), he is building himself up (Jude 20), he is doing what God wants him to do (1 Cor 14:5), and more.modern tongues serve no purpose other than being able to tell people you speak in tongues.