I do not want to argue with you, but as you asked , its vary machan. it depends on many factors
But if all possible interferences excluded, a GSM communication can be reached reliably between a base station and a device at a distance of 35 km. and CDMA will reach as far as 70-75 km, yet these are not practical for quality utilisation. Mind you the interferences to upward directed ground stations (like GoGo) is very minimal as compared to our day to day mobile phone towers. That is why I said both systems have advantages as well as disadvantages! ATG wi-fi America, Canada, Russia waage ratawalata godak usefull satellite ewata wadaa