15. The portable communication device as defined in claim 14 wherein the user input comprises: a navigation key having at least two control keys, wherein a first control key provides for accepting of the most probable completion alternative.
15. The portable communication device as defined in claim 14 wherein the user input comprises: a navigation key having at least two control keys, wherein a first control key provides for accepting of the most probable completion alternative. 16. The portable communication device as defined in claim 15 wherein a second control key provides for removing the added most probable completion alternative from the content string.