Would anyone care to comment on which cellphone providers allow the highest security? The article recommended the following: "Call your cell phone provider and

Would anyone care to comment on which cellphone providers allow the highest security? The article recommended the following: "Call your cell phone provider and set up a PIN or password, ask for a port freeze and ask to lock your account to your current SIM." It seems maybe we need a website/git-repo along the lines of https://twofactorauth.org/ https://twofactorauth.org/, but explaining phone provider security supported by provider. Other than that there was a suggestion to have a special cellphone which is only used for SMS auth, and which you don't publish the number for.