18. A dual-mode keypad, comprising: a plurality of dual-mode keys that each include an associated telephony character and at least one associated text-entry character, wherein the dual-mode keypad has two distinct ergonomics depending upon whether the keypad is in the text-entry or telephony mode such that the text-entry characters are arranged in a QWERTY-style keypad and the telephony characters are arranged in a traditional telephone keypad layout; the dual-mode keys including one or more toggle keys, each toggle key having a plurality of associated text-entry characters and one associated telephony character; the dual-mode keypad being operable in a telephony mode and a text-entry mode, with a key for switching between the telephony and text-entry modes such that when the dual-mode keypad is operating in text-entry mode, the dual-mode keys are operable to input the associated text-entry characters, with the toggle keys each being operable to input a first text-entry character when a first portion of the toggle key is pressed and to input a second text-entry character when a second portion of the toggle key is pressed; when the dual-mode keypad is operating in telephony mode, the dual-mode keys are operable to input the associated telephony characters, with the toggle keys each being operable to input one of the associated telephony characters when any portion of the toggle key is pressed; and further comprising one or more single-mode keys, each single-mode key having at least one associated character and operable to input the at least one associated text-entry character and no other functions when the mobile device is in either the telephony mode or the text-entry mode, with said single-mode keys not being operable in both the telephony and text-entry mode and said single mode keys being arranged in single mode key columns with no dual mode keys in said single mode key columns such that said single mode kegs do not share columns with dual mode keys, wherein the dual-mode keys are larger than the single-mode keys.
20. The dual-mode keypad of claim 18 , wherein at least one of the toggle keys are operable to input a fourth text-entry character when a fourth portion of the toggle key is pressed.