tl;dr–you don’t.
This link is a much better and involved post on this topic.
SIM cards were first installed on mobile phones to identify the payee of mobile phone plan to…
Porting is the ability you have to swap your phone number from one carrier to another. Carriers can be traditional telecoms or services like Listen and Google Voice.
Remember how you used to have to switch your number when you got a new carrier…
Starting a series to dive into the particularities and (often) absurdities of the telecom industry in North America.
tl;dr? AT&T spies on you for profit, we don’t.