It's a feature some phones have where you can program a number into your phone and then when you want to call it, you only have to push usually two buttons.
Speed dialing is a system that allows you to dial an abbreviated code (usually one or two digits) instead of dialing the entire telephone number. You must program your speed dial numbers before using them.
The speed dialing option is not only good for its convenience on dialing numbers fast but if used the right way while driving; while at a light or a pause in traffic flow speed dialing can be utilized very effectively while driving.
DID means Direct Inward Dialing Feature in the PBX features in telecom.
Pretty much any phone (even feature phones) can be configured to use pulse dialing. Some phone companies (e.g. VoIP providers) do not recognize pulse dialing, though.
To route calls to appropriate internal stations without the assistance of an operator
That feature is generally not available on cell phones, although there may be an app for that.
their speed
The function of Direct Inward Dialing is to map a block of numbers on the public telephone network to a block of extensions on your PBX, so that an outside caller can dial directly to a specific extension without going through a switchboard or automated attendant.
A Fixed Dialing Number (FDN) is a feature on mobile phones that restricts outgoing calls to a predefined list of phone numbers. This feature enhances security and control, allowing users to limit communication to specific contacts, which can be particularly useful for parents managing their children's phone use or for businesses controlling employee communication. When FDN is enabled, any attempt to dial a number not on the list will be blocked.
speed
The dialing code for Barbados is 246
Direct inward dialing is known as DID