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Roaming just isn't a practical solution (way too expensive) but neither is this. Honestly swapping out SIMs between country isn't too difficult of a task, and likely saves you a ton of money when compared to roaming or this "borderless SIM." Lots of countries go with cheap prepaid options anyways.

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The problem with swapping out SIMs is that people who have your phone number can't contact you.

AT&T Roaming typically costs about $500-$800/month with their international plan for $120/ 800 MB roaming, $150/Gigabyte. It's a pretty common plan for US road warriors who are probably racking up $20,000-$25,000 in Hotel/flight charges already.

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