As other answers have said, the 3-by-4 grid of numeric keys is a telephone keypad. But that doesn't usually include the surrounding keys.
There's no single word for that exact arrangement, as there were umpteen variations of that sort of feature-phone keypad. (All had an ‘answer’ button and a ‘hang up’ button, and most had at least one ‘soft’ key, but some had many soft keys, in various arrangements; some had two arrow buttons, or four, with or without a centre button, while some had a mini-joystick in its place; some even had dedicated buttons for calendar, contacts, email, &c.)
So I'd call it a phone keypad. (To me, that's less specific than telephone keypad, and could include all the varieties above.)
Or, even more generally, just keypad. (Which would also include door-entry keypads, lift/elevator buttons, ATM keypads, and the like.)