Telemarketers. Buy phones and use first one in area code of people you are selling to or scamming. Make a thousand calls over one/two day period-before the AG gets after you. Ditch phone. Collect $$.
Rinse and repeat...
I managed a telemarketing group for 10 years.
You just made me laugh out loud.
For 99% of the telemarketers we hired, if you gave them a potable cel phone they would take the phone and you would never see them again.