Make field not able to change after register ie user name, email and mobile number + 2FA ?

Hi I wonder how you can make the fields like field not able to change after register ie user name, email and mobile number? I see this Joomla plg that can hinder part of that but how do you do this best for ES?

https://ghsvs.de/programmierer-schnipsel/joomla/112-benutzer-sollen-ihre-accountdaten-nicht-aendern-duerfen

And second question how can you make 2FA authentication by mobile/sms instead of email for ES? example info https://www.smsglobal.com/two-factor-authentication/

Thks.