commonly known as text messaging, allows the transmission/receipt of short messages (160 characters) to other devices which support the service. All mobile phones provide this service. Each message costs 12p on most networks, although different messaging tariffs are available.

A message format which allows users of mobile phones and devices to send short, simple messages to each other.

A service for sending messages of up to 160 characters (224 characters if using a 5-bit mode) to mobile phones that use Global System for Mobile (GSM) communication.