I looked for existing threads, but couldn't find any relevant info; so decided to start a new one. When sending an SMS from Messenger, type three or more consecutive numbers, followed by a letter (for example: 1024k). The moment you hit the space bar, the display changes from "1024k|" (the vertical bar is the cursor) to this: "102k |4k"

Previous versions of Harmattan used to not do this (at least 1.1; can't remember about 1.2).