Dear friends, I live in Argentina, in Patagonia. My device is a GPSMAP 66i and it does not work with the Mapshare application. I have sent many SMS. With Claro it never worked, with Movistar only a couple of times, AT / T and Movistar Spain received. I have been in contact with Garmin Latam support (Hector and Felix) by phone for 1 month and they have not even responded to emails. Garmin Argentina (GPS Mundo) pretend to be distracted and continue to sell equipment that does not work to send SMS. I am currently in a complaint with Claro Argentina and every day they call me and send me emails to solve it. I have a corporate plan with my company of 120 telephone lines and I told them that if they did not solve it, I would go to Movistar. I hope the threat works and they can solve it. Greetings to all the forum.