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That's why so-called over-the-top apps have become so popular. ] Over-the-top (OTT) apps are third-party messaging services that don't use the carrier's SMS delivery system and instead push messages through the mobile device's data connection. Informa points out that the chat app users are sending an average of 32.6 messages per day, while SMS users are sending an average of 5 texts per day. What are these OTT mobile messaging apps, and where can you get them?