Also if you answer unknown phone numbers give the greeting of your city's police department and ALL scammers will immediately hang up.
then BLOCK that number forever. Personally I never answer any call that I do not know I tell them I will NOT return their call without a voice mail on the answering message. This also helps eliminate scammers and all computer placed calls because they never get all the way thru their message. Then they get blocked.
Some companies do not leave a gap between a disconnected/changed number and the next person getting that number assigned.
The best one with my new phone & company (free gov phone) is the 50 or so calls to invite me to move my medical practice to Baton Rouge Louisiana and a call back number. WHY would they call me? I'm not a doctor. I'm a Childrern's Minister.
Have fun and a great day.
AT&T NEVER sells their numbers but most of the rest do.