Talk:Russia/@comment-176.88.70.215-20170808221807/@comment-24682153-20170809083231

It seems to be the same for the Metro Wifi:

from WikiTravel: "All trains in the system have free WiFi onboard, but you will need to have a Russian phone number to get the authorization code to access the WiFi."

http://wikitravel.org/en/Moscow

So it makes sense to get a local SIM card for the WiFi too.