Out-of-vocabulary (OOV) word determination corresponding to a key sequence entered by the user on a (typically numeric) keypad, and a user interface for the user to select one of the words, are disclosed. A word-determining logic determines letter sequences corresponding to the entered key sequence, and presents the sequences within the user interface in which the user can select one of the letter sequences as the intended word, or select the first letter of the intended word. When letters are selected, the word-determining logic determines new letter sequences, consistent with the key sequence and the selected letters, and presents the new letter sequences. The user again selects one of the letter sequences as the intended word, or selects the second letter of the intended word. This process is repeated until the user has selected the intended word.