2. What is Text Messaging
Text messaging, or texting, is the exchange of
brief written text messages between two or
more mobile phones or fixed or portable
devices over a phone network. While the
original term was derived from referring to
messages sent using the Short Message
Service (SMS).
4. SMS Gateway
An SMS gateway is a telecommunications
network facility for sending or receiving Short
Message Service (SMS) transmissions to or
from a telecommunications network that
supports SMS.
Most messages are eventually routed into the
mobile phone networks. Many SMS gateways
support media conversion from email and other
formats.
9. Short Codes
Short codes (also known as short numbers) are special telephone numbers,
significantly shorter than full telephone numbers, that can be used to address
SMS and MMS messages from certain service provider's mobile phones or
fixed phones. There are two types of short codes: dialing and messaging.
Short codes are designed to be easier to read and remember than normal
telephone numbers.
Short codes are widely used for value-added services such as television
program voting, ordering ringtones, charity donations and mobile services.
You can even subscribe a customer to a recurring monthly service that will be
added to the customer's mobile phone bill until the user texts, for example, the
word "STOP" to terminate the service.
http://gigaom.com/2007/03/16/10-things-to-know-about-short-codes/