[paranoidrobot]

It's primarily an American problem, but I've seen in the last year or two an uptick in certain kinds of Spammy activity to my Australian mobile number.

The most prominent type, and have appeared in the last two years are the one-ring-only calls from some foreign country. They're trying to get you to call back to some premium-rate number.

The second are SMS based random spam. Just an hour ago I got spam from "JbHiFi" (even though it's not them, I've never given JB my number) with phishing/spam "you won a contest". I also get random SMS spam from other sources.

Then again, if you have any kind of landline in a regional area you're going to get a ton of fake NBN/Telstra/ATO/etc scammers.