Hailing frequency - When you try to chat with someone you don't know, even if th

When you try to chat with someone you don't know, even if they're across the galaxy or just in the next class.

I hailed a freq with my math teacher. He gave me a detention.

I tried to talk to my crush. I hailed a freq. She said 'What?'

I opened a hailing frequency with my neighbor. Now he sends me memes.