I can say from personal experience that even with my American cell phone "activated" to work in Mexico it didn't.
Unfortunately cell phone system coverage is still quite unreliable in So America, especially a few miles outside of the major cities and going from country to country. Too many headaches for a "foreign" cell phone.
Best reliable solution:
Rent an Iridium satellite phone (USD $40-50 / week). It works anywhere in the world, even in the most remote areas and there is no need to mess with chips and GSM and spotty cell phone coverage etc. By the time you figure in all the cell phone roaming charges, special fees etc, the cost of the calls may be a wash. And the best part: it works anywhere, not just in the cities like the regular cell-phone.
ride safe...
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Ride On!
A.T.
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