International Phone Plans

Moving to Japan for a new job I got. It’s with a company that is contracted by the DoD for its services and I’m given orders with the position so I enter the country on SOFA status (just in case any of that info helps or is needed). I’m trying to get a phone plan that won’t fuck me over as everything in my life is tied to my US number. Google fi doesn’t support for contractors, spectrum won’t do mobile unless I also set up internet, T-Mobile and AT&T told me that they only offer temporary services for international use. I know people have done it to keep their US number but I don’t know if I’m looking at the wrong carriers or if I’m asking the wrong questions when I speak to some of these companies (I know one of my coworkers uses T-Mobile even though they told me on the phone they don’t). Looking for help at finding a good service to use or help on wording what I’m needing to one of the already mentioned services. Thank you all for the help!

by Many_Radio_8771