What's the latest regarding cellular coverage in Peru (Lima, Machu Pichu,
Cuzco) and Argentina (Buenos Aires, Mendoza, Lake District)??

Last time I was in Buenos Aires I got great GSM coverage, but no CDMA (which
I thought was the main band used there, but at the time -- maybe now too --  
Verizon didn't have a roaming arrangement).  Don't know about other parts of
Argentina, and I've never been to Peru.

Thanks.