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Old 01-12-2017, 11:54 PM
greghughespdx greghughespdx is offline
 
Join Date: Nov 2011
Location: Aurora, OR
Posts: 508
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Cellular/similar services generally have limits on distance from towers in order to ensure service coverage is not impacted and that it's provided correctly. Round-trip times can be calculated and used to deny service where a device/phone is too far from a tower (whether laterally or vertically), even if it technically has line of sight to the tower and the signal can reach.

I use my phone in the air in my personal airplane and it often works (although tends to be spotty). But at higher altitudes, the service tends to go bye-bye. My hypothetical experience would be Verizon, ATT and Sprint. Generally speaking, those are listed in descending service quality/reliability order from my hypothetical cross country flights.
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