Comment by carstenhag

But it's never going to be universal. I felt very scared some weeks ago during a huge march against rightwing extremists in Munich, Germany. There were ~150k people concentrated on a few streets/km.

Now, how is this relevant? Well, the entire cell network was offline, at least for some providers. At first it wasn't possible to send/receive data. Calls were connecting, but my friend sounded like an alien. Then for one hour, 0 communication was possible.

So even though the most efficient (I think?) protocol was used, it came to a halt