I had the ability to swap numbers for 3 carriers as a minimum wage paid Radio Shack employee.

It was just a web form with a few boxes to fill out based on customer provided info followed by enter.

Even when ID is checked, a decent fake ID is like $50 these days, and grants access to wealthy bank accounts.

At the time we were heavily incentivized to speed run anything that did not generate a commission so checking ID carefully if at all was not high on our list of priorities.