Cell Broadcast (CB) is a variant of the Short Message Service (SMS), which is used in European GSM networks
. With cell broadcast, an alphanumeric message is sent to a specific group within a regional area. The area is called Cell Broadcast Area and can be defined in size by the information provider. All recipients within this area receive the same message. A CB message can consist of up to 1,395 characters. Each message is composed of up to 15 pages, where each page in turn can have 93 alphanumeric characters or a total of 82 bytes
in length. Atotal of 2exp16 broadcast channels can be supported with Cell Broadcast, i.e. 65,536.
If CB messages are transmitted via the short message service, then they are SMS CBs. Corresponding messages are provided with a topic ID. The maximum length of an SMS CB is 93 characters.