1. A method of inputting text using a mobile device with a limited character keypad having multiple different letters associated with each of a plurality of numbered keys, the method comprising: receiving from a user a first portion of an input string comprising at least one keystroke on the limited character keypad, the first portion of the input string representing at least one wildcard character; and receiving from the user a second portion of the input string comprising at least one keystroke on the limited character keypad, after the first portion of the input string representing the at least one wildcard character, with all keystrokes of the second portion representing non-wildcard characters.