You have probably seen business men/women running round
Security Guards, Police AOS, Couriers, Ambulance, Fire, Real estate agents all use
this mode to send text messages between the control room and the person in the field.
Pagers come in three basic forms:-
These pagers only start beeping when called.
Number These just receive numbers.
Alphanumeric These receive full text messages.
Software to decode this stuff
What you will see when you do get if running.