I'm planning a tour of Paraguay, as it is in remote areas with access to a mobile signal? I'll need to call to Europe.
They can be used from this site preferences?
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The only way you can find out definitively if you'll have mobile-phone coverage is to be there. However, please note that mobile-phone penetration in Paraguay is quite high. According to 2014 statistics from the International Telecommunication Union, a United Nations agency, there were an estimated 7.3 million mobile-phone subscriptions in Paraguay, which has a population of about 7 million.
Generally, you can get mobile-phone coverage in a lot of places in developing countries. Some cellphone towers operate with generators and/or solar panels. In remote areas, people may not have electricity in their homes. But they might have cellphones, which they recharge at local markets, where generators are available. However, in some very remote areas, including regions with significant geographic barriers, cellphone coverage is limited, or simply not available. That's also true in the U.S. Hope this helps.
[ Edit: Edited on 30-Sep-2015, at 12:57 by berner256 ]