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Comment Re:Range of that Weather-Balloon's WiFi (Score 5, Informative) 141

You don't realise how cheap the sondes are. There are hundreds launched every day, and they don't get them back. They have to be incredibly cheap and there are no GSM technologies cheaper than a simple FM radio.
There are technical limitations too - GSM only works up to about 5km, above that they will likely fail. Sondes usually fly to about 30km.

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