@WoodshopHandman Most of the mvno carriers will let you bring your own device. China makes a ton of globally compatible phones. Rugged style dumb phones? Ali Express. Just make sure it has the bands you need. It's hard to get a full on "dumb phone" because sms is kind of the old standard so a lot of cheapo ones throw in WhatsApp even in dumb phones, but you can disable it usually.
This one is like $22 with two US reviews on AliExpress.