SMS in the older times used a new kind of technology that was called radiotelegraphy that was used by many modern devices at that time. They used the standard communication protocol, which was defined in the year 1986 as part of the Global System of Mobile communication (GSM). The first test message was sent in the year 1992, and since then all the people started using this service, and it got famous. Then in the year 2010, every phone had inbuilt SMS, and there was also a new kind called SMS verification online.