How to stop annoying robocalls on your iPhone or Android phone
Mobile spam calls have been a nuisance for years. I get between four and six robocalls daily, and a quick survey of friends shows that I’m not alone. Every waking day brings with it a new barrage. Robocallers have upped their game by masking their spam with local, genuine-looking phone numbers. Sometimes their…

This number called me three times. I ignored the first two, and then answered the third; I said "hello," and then I was hung up on. Seems rather suspicious to me.