My wife has gotten a number of robocalls spoofing her own cell number recently. Her sister got two robocalls spoofing my wife's cell number.
Not sure how they are doing that. I hope her phone hasn't been hacked.
For a long time I would get robocalls from "Adrian" asking if I would sell my property. Sometimes I'd get two or three a day on my personal cell, and they almost always spoofed a different number. And "Adrian" always left the same canned voicemail since I didn't pick up the phone. Of course every number he called from was added to my blocked caller list, but being an Android phone, blocked calls can still leave a voicemail.
I am sure my blocked caller list at least five times longer than my legit contacts list on that phone.