How speed dialling works?

Quite simple really. The phone contains a memory and software which you program to remember things like last number called or any other number given a code for its storage location. There will be a command code such as #x where x is a number from 1 to 9 or even more sometimes and the phone software reacts to a command such as #6 to use the dial code stored in location 6. All mobile phones have number memories saved with names, same logic as you "call" a name and the phone retrieves the number from memory and passes the series of numbers to the service provider hence establishing the call. Speed dialling just allows you to store some numbers and call by hitting fewer keys than remembering and entering the whole number each time.

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