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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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my question was different.help me out please
LOOK new developmnt whch improving communication are - social networking, mobile phones,satellites...
New developments which are improving communication routes in regions of high altitude are satellites,social networking,wireless networks,etc....,......
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