This is the sort of thing you should be doing with your wing on a whim. It's spontaneous and fun, and even better, it's like you're lightly taking the piss out of the group before you meet them. They're more likely to give you some attention and give some 'banter' back. From there you're in.

Stuff that's rehearsed or preconceived would be unlikely to work though. Like SJ said, it's a bit cheesy and is very obviously a pick-up attempt. Maybe if you actually answered the phone to your wing and started to talk about the fit girls it might come off better.