[wutwutwat]

Wonderful open standard SMS is, we should keep using it forever

> Silent SMS

> In 2010 Germany, almost half a million "silent SMS" messages were sent by the federal police, customs and the secret service "Verfassungsschutz" (offices for protection of the constitution).[83][84] These silent messages, also known as "silent TMS", "stealth SMS", "stealth ping" or "Short Message Type 0",[85] are used to locate a person and thus to create a complete movement profile. They do not show up on a display, nor trigger any acoustical signal when received. Their primary purpose was to deliver special services of the network operator to any cell phone.

https://en.wikipedia.org/wiki/SMS#Vulnerabilities

Let's not forget the messages sit unencrypted on your providers servers until they can be delivered. During such times, anyone with access who cares to look, can look, and it's very often looked at, if not always