Not What I Meant
Back before smartphones were a thing, people threw pebbles at their girlfriend/boyfriend’s windows to get their attention. Nowadays, we don’t even ring the doorbell; all we do is text them, letting them know that we’re outside and ready to go. Not that that’s a bad thing. We’re not boomers, by the way.
The OP reminded her boyfriend that he had a phone he could use to text her. He could stop throwing stones at her window to get her to come out. That’s when he threw his smartphone, mistaking her what do you have a phone for message. Smoov moov.