Whom would you send an empty text message to?

This seems silly, I am aware, to send an empty sms/text message…
I read about it today, in a literature critique, and it got me thinking about it.
What would I think if I received one?
What would I assume the hidden message would be (if any at all)?
And would my assumption change depending on the sender?
My question:
Who would you (like to) send one, and what would your intention with it be?