Short Message Service: available on digital GSM networks allowing text messages of up to 160 characters to be sent and received via the network operator's message center to your mobile phone, or from the Internet, using a so-called "SMS gateway" website. If the phone is powered off or out of range, messages are stored in the network and are delivered at the next opportunity.

A software development kit (SDK or "devkit"), also known as a native developer kit (NDK) is typically a set of development tools that allows a software engineer to create applications for a certain software package, software framework, hardware platform, computer system, video game console, operating system, or similar platform.

Also known as: SMPP

Short Message Peer-to-Peer Protocol (SMPP) is the convention for how SMS messages will be exchanged between two elements, such as Short Message Service Centres.

This non-proprietary protocol is widely used, and it enables the smooth transfer of messages over the interfaces between the mobile and fixed parts of a network. This protocol also permits the sending of bulk messages from organisations to multiple subscribers.

The Subscriber Identity Module is the smart card used in digital phones containing the user’s identity for accessing the network and receiving calls. It can also store personal information, such as a phone directory and received SMS messages.