If you have control of the national uplinks to the rest of the world, it's quite the simple affair to turn off traffic for ISPs. If you are a telecom provider and you are visited by military with authority to shoot you on the spot, you are quite inclined to obey and shut down the network as it will happen regardless you are alive or not.

Whatever wired local city networks may still function or not, depending on circumstances and the phase of the moon. Likely they will not be able to communicate with anybody else though.

Then there is nothing much to do for any opposition but to use covert satellite communications and those are much too important and slow and expensive for sharing with memes and porn.

[–] Munkisquisher@lemmy.nz 4 points 5 days ago

They are shutting down the ISPs so that people can't communicate within the same town and organise protests, it's not just disconnecting from the wider web.

They're also using military jamming equipment on starlink frequencies too.