GSM around the world

I found this world map in PDF where places with GSM coverage are coloured in brown (and 3GSM coverage in yellow). It’s a quite big file (21.8 MB), but it seems interesting, since one of the problems the airship will face during its journey will be the lack of coverage (that may determine the route it will follow).


In the website where I downloaded that map I also saw an ad about global SIM cards. It’s called MobilityPass, and they claim their rates are much lower than any other roaming service. I haven’t check their rates yet, but this system (or any other similar done by any other company, if exists) can be a solution for the access to GSM.