1. A method of enabling input on a handheld electronic device that comprises a plurality of keys, at least some of the keys having characters assigned thereto, the method comprising: monitoring for a number of key inputs in a key first input sequence, each key input corresponding to at least one selection of one of the plurality of keys; responsive to a first one of the key inputs, initiating a text entry session on the handheld electronic device, wherein the text entry session comprises disambiguating the first key input sequence upon each actuation of the number of key inputs; detecting an input in the handheld electronic device as a delimiter input and, responsive thereto, terminating the text entry session, wherein terminating the text entry session comprises terminating the disambiguation of the first key input sequence; detecting a post-termination key input indicating an entry of a linguistic character and, responsive thereto, appending the post-termination key input to the first key input sequence without an intervening delimiter to form a second key input sequence, the second key input sequence concatenating the first key input sequence and the post-termination key input; and responsive to detecting the post-terminating key input indicating the entry of the linguistic character, resuming the text entry session, wherein resuming the text entry session comprises disambiguating the second key input sequence that includes both the first key input sequence and the post-termination key input.