Best/Cheapest way to keep US cell number?

Hi I’m moving to Japan soon and wondering if anyone from the US has any advice on the best and cheapest way to maintain an existing US cell number. I want to keep it in case I need SMS when logging into to certain services.

Any best practices?
So far I’m thinking switching to the ATT yearly prepaid plan may be the most reliable and cheapest choice…

by Inter_tky

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