No problem. I'm actually using my cell phone also but I type Chinese using a Jyutping keyboard. The lady though probably would say 『你係____到不得了』(____being an adjective) or could just say 『不得了!』。And you could wait until you use your computer to understand the Chinese if you can't read. It's just that characters (plus English translation) are better for explaining than just English or even English and romanization of the Chinese.
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