There is phone service on the metro, even if it feels a million miles underground and you can't read any of the signs. Some bars are open mega late - till 6am!! Moscow is huge - we're talking 18 million people. The busiest McDonald's in the world is Pushkin Square. Hangover McMuffin sorted.
Unless they work in a hotel or international bar, no one speaks English. While winter is beyond freezing, summer can be insanely hot at 40c+! Traffic is always bad and for no apparent reason. Cabs are pretty affordable but have a minimum charge of 500 rubles.