Tekstisõnumeid
Tekstisõnumeid, commonly known as SMS (Short Message Service), are a fundamental form of digital communication. They allow users to send and receive short text-based messages between mobile phones. The standard SMS message has a character limit, originally 160 characters, though longer messages can be sent by concatenating multiple SMS messages. This technology was developed in the late 1980s and became widely adopted in the 1990s.
The transmission of SMS messages occurs over the cellular network, utilizing control channels rather than voice