Short Codes are network specific access codes used for sending and receiving messages (both SMS and MMS) between consumers and companies. Short codes are recognized for use around the world in specific countries and are shorter than a normal mobile phone number, usually consisting of four to six digits, depending on the country. Short codes are used because they are memorable and easy to enter into a phone. They can also spell out memorable brand names (phone words) (for example, 1-800-468-5865 for 1-800-GOT-JUNK), so the short code could be something like 485865 (GTJUNK).
