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Aside from the onesim mentioned above, there is no carrier I am aware of in South America which covers all of those places without incurring roaming charges. Movistar is in all of those places, Claro may be as well, but when you register for the SIM, you incur roaming charges once you move to the next country. A few years ago, getting a SIM in each country ...


I've used http://www.onesimcard.com/ in Mexico (supposedly it works in more than 200 countries), but I can't recommend it 100%. It can be difficult to use, and the calls and SMSes often failed. But of course it's better than nothing! I would recommend getting OneSimCard as a backup, but then trying to pick up a cheap SIM card in each country as a primary ...

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