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Nothing.

I've been using my phone as a backup git remote for a few years: https://play.google.com/store/apps/details?id=net.antoniy.gi...

Well the battery would become the UPS of the device, it would instead run off wall power normally.

I already have a small phone farm like that for testing stuff, just not actual hosting.

Never tried to build a whole linux hosting environment on a phone though, not enough motivation because they haven't been powerful enough yet.

When you're distributing something that the government doesn't want you to distribute.

Could be a super cool mesh network thingy, (wasn't Diaspora supposed to do this?) bitcoin?

> When you're distributing something that the government doesn't want you to distribute.

Mobile phones (and their networks) are under heavy surveillance.

https and ssh?

You can run a hidden service off your phone using orbot.

Why would you run a server on a battery? It would be plugged in ofcourse. The purpose would be a low tdp server more powerful than a raspberry pi and a touchscreen included.