I moved to Europe about a year ago and I think I get about 2 or 3 robocalls a week. Which is pretty bad considering my phone is on airplane mode any time I'm on

I moved to Europe about a year ago and I think I get about 2 or 3 robocalls a week. Which is pretty bad considering my phone is on airplane mode any time I'm on wifi. Pretty bold of those companies to submit blank documents. I wonder if there was something that inspired them all to do this like a phrase somewhere saying that they have to submit something even if it's nonsense.