It's not hard to forget to switch off the phone on departure if it's sitting inside a bag. Maybe this guy left his on and it went off as it came into range of a cell and the backlog of messages arrived, during landing.
pilots on an A321-200 travelling from Darwin received an on-board warning when the aircraft carrying 167 passengers was only 122 metres above the ground on approach
Whatever the reason for over-looking the gear, they appear to have selected landing flap (and triggered the config. warning) at less than 400ft. Is this normal in JetStar? What are the JQ stabilised approach criteria regarding flap?
Of course, it's always possible, even probable, that the halfwit, semi-literate "journalist" who wrote the article has the facts wrong.