Family plans work even if you are away from home. (interestingly, auto insurance does too.)
For ~15 years we used the $49 T-mobile plan + $5 for kid's add-on lines. Well, to be fair, it had changed over the years and even discontinued but they wouldn't terminate existing plans (how nice; it is like grandfathered New York apartment leases). They have it offered again now. Data is not unlimited but there is enough for my kids. ymmv
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