[henadzit]

Telemarketing or political campaigns. Check out the Robocall article on wiki. In Europe it depends on the country. In Poland I receive a few calls daily but they are people calling me, not bots. Never received a robocall here.

[pessimizer]

In the US, the vast majority of them are simple frauds. For a year I got a robocall every few days from a Chinese woman (in Chinese) that a friend of mine said is a threat to get (the hypothetical Chinese immigrant) me deported unless I pay them.

Right now I'm getting a fake credit card debt collection call (I've never had a credit card in my life, only debit), and a call telling me that I'm eligible to have my AT&T (phone) bill halved (I don't have AT&T phone service) and all I have to do is call the number "on my caller ID." I think those two are both being read by the same woman (not the Chinese one.)

I'm more of a texter than a caller, so the vast majority of calls I get are robocall frauds. I'd love to get a robocall that was just annoying for a change, rather than completely predatory.