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> Call your cell phone provider and put a “do not port under any circumstances” hold on your phone number.

How do I do this for AT&T?

AT&T Web-based chat support will do it in about 5 minutes. Ask for a "port block" so other carriers can't port your number away from AT&T.

Even if you don't use SMS as a second factor, unless you regularly switch carriers, there's no downside to doing this.

Do you know if this is reversible? If I ever want to switch at some point in the future?

Yes, just chat with or call your existing carrier to un-lock your number before porting.

I went through the online chat, after much back and forth the only thing they offer are (to a regular user like myself, don't know about business accounts): 2- passcode you setup online, 4-8 digit number, in addition to your number, that is required for both online or in persona interactions with ATT support 1- "we will inform you before we transfer your number"

I have only heard of this on business accounts. Not sure they will do it for consumers.

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