Answers

2014-03-31T14:13:26+05:30
Mainly -- mobile phones / satellite phones 

the problem with both is a power supply. 

High altitude areas are mountainous and not served by mains electricity. 

So diesel generators or solar/wind power is needed.
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LOOK new developmnt whch improving communication are - social networking, mobile phones,satellites...
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2014-04-03T21:38:53+05:30
New developments which are improving communication routes in regions of high altitude are satellites,social networking,wireless networks,etc....,......
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