A "telephone keypad" refers to the group of buttons or keys found on a telephone that are used to input numbers and symbols when making a phone call. Full definition
They don't like Interactive Voice Response, which collects answers via speech recognition or respondents» input on telephone keypads, either. (canadianbusiness.com)
When in portrait mode the keyboard is formed after a standard telephone keypad with 3 letters per number, so typing takes some concentration unless you are text savvy. (littletechgirl.com)
There is also a touch sensitive telephone keypad that has twelve memory places (freely selectable); this allows the driver and passengers access complex functions without the need to move around the dash board. (thesupercars.org)