Well
... you're on the street outside her place.
She asks, what are you wearing? You say red "tee shirt and blues jeans". She says "red tee shirt and blue jeans?"
Darren is on the other end of the other phone that she is holding.
Darren is on a moped just around the corner and now knows which one is you, that you have your phone clamped to to your ear, and that your entire focus is on trying to get in to see someone in order to stick your dick into them.
No idea what happens next.