Source: wikibot/e-161
= E.161
{wiki=E.161}
E.161 is a standard developed by the International Telecommunication Union (ITU) that specifies a numbering scheme for telephone keypads. It defines how to represent alphanumeric characters on the 12-key telephone keypad layout commonly found on mobile phones and other telecommunication devices. In the E.161 scheme, each number key is associated with a set of letters, enabling users to input text through the numeric keypad.