I assume state on state cyber attacks are commonplace but get minimized to avoid public fear.. perhaps this will be the first notable one.
Made worse by the fact Estonia is a more networked society than, for example, the US.
https://downdetector.com/status/t-mobile/ ~ 1,600
https://downdetector.com/status/att/ ~ 1,500
https://downdetector.com/status/verizon/ ~ peaked at ~169k, dropped to 67k