SMS
n. C / Un. Stands for Short Message Service. A short text message sent from one mobile phone to another. It is the standard way to send a quick note without using the internet or an app.
n. Abbreviation for Short Message Service. A protocol for sending short text messages between mobile devices. Often used metonymically to refer to the message itself.
I sent an SMS to let him know I arrived safely.
The bank sends an SMS with a one-time code whenever you try to log in from a new device.
While instant messaging apps have become the primary mode of digital communication, the SMS remains a critical fallback for emergency alerts and two-factor authentication in areas with poor data coverage.
From German SMS.
Countable when referring to the message; uncountable when referring to the technology or service.