Other early "instant dialers" dating back to 1972 also included punched card machines and magnetic tape machines. The capability for speed dial historically dates at least as far back as the Number One Electronic Switching System (1ESS) in 1965. Most mobile phones have a contact list feature which provides similar abilities although most have an instant call button which only requires one click. The numbers are programmed by the subscriber through the standard telephone dial, and speed dial calls are placed by dialing simply the digit and waiting a few seconds on a standard rotary dial phone and an older 10 key Touch Tone phone, or by dialing the number and the # key to instantly connect the call on a modern 12 key Touch Tone phone. Speed dialing is also available via Custom Calling features from the Telephone Company's Central Office. The speed dial numbers are usually accessed by pressing a pre-determined key or keys on the phone, followed by a one or two-digit code which the user assigns to each number however for ease of use, on many systems a call may be placed by pressing and holding one key on the numeric keypad. In most cases, the user stores these numbers in the phone's memory for future use. This function is particularly useful for phone users who dial certain numbers on a regular basis. Speed dial is a function available on many telephone systems allowing the user to place a call by pressing a reduced number of keys. JSTOR ( January 2017) ( Learn how and when to remove this template message). Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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