Who I have the same questioned this topic

Does Verizon provide in-store verification of identity to facilitate porting a number to a new SIM? If not, why not? T-Mobile is doing so in order to counter an increasingly popular hacking technique. ( https://lifehacker.com/prevent-sim-swapping-hackers-from-stealing-your-phone-n-1838149833 )

"Some providers offer tighter security upon request. According to Motherboard, T-Mobile has a security option called “NOPORT,” which mandates that porting your number to a new SIM or provider requires a photo ID check, which needs to take place in person at a store. That takes phone- and chat-based ruses off the table. According to the same report, Sprint also has a high-security designation called “Security Plus,” which must also be requested via customer service."

https://www.vice.com/en_us/article/ywa3dv/t-mobile-has-a-secret-setting-to-protect-your-account-from...