Both mobile number portability and SIM swap are stupidly insecure in the US. In every other country, you need to initiate the port with your current provider -

Both mobile number portability and SIM swap are stupidly insecure in the US. In every other country, you need to initiate the port with your current provider - usually by sending a text from your phone. Over here, I can do it from the receiving provider and that makes it really easy to bypass security checks. Similarly for SIM swaps - there's very little security and social engineering will do the job of bypassing it. I see plenty of people suggesting we don't give phone numbers at all. That's not very convenient for most people. I consider myself savvy and use 2FA and password managers ...etc. But by the time I realized this issue, I had given my phone number to most important services. This and spam are two very serious issues in the US that's already solved in most countries of the world.