To find someone in a large crowd using your cellphone.

Solarpunk is a movement focused on a positive, ecological vision for a future where technology is used for human-centric and ecocentric purposes. It is a literary, artistic and aesthetic sub-genre and is also closely tied to eco-political activism. Solarpunk narratives have a distinctly positive and utopian foundation in contrast to the often dystopian visions found within other "punk" science fiction genres.

To call someone on a cell phone in order to locate where they are. Usually done when you are at the same physical location and uses the conversation to close in on the person you're trying to find.