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In this video tutorial, the presenter uses a Kenwood THD 74 handheld ham radio to send and receive SMS text messages without relying on a cell phone or computer. The focus is on APRS (Automatic Packet Reporting System), which ham operators use to send data packets. These packets can include details such as callsign, GPS data (speed and altitude), station type (boat, car, home), and messages. The established APRS infrastructure comprises I-gates, which connect packets to the Internet, and digipeaters, which extend range by relaying packets. The tutorial also mentions low-earth orbit satellites that assist with data transmission.