MTS, MegaFon, Beeline and Tele2 cover cities and main rail corridors on 4G; Siberian taiga, Far East Kamchatka and Arctic approaches fade for long stretches. Moscow and St. Petersburg metros have partial underground coverage. Check the network list above for Russian Federation before you fly; it shows what is available right now, including options such as Tele2 Russia, Beeline Russia, MTS Russia, MegaFon Russia.
There is no complicated Russian Federation-only product to learn. NXTL is one global eSIM: the same profile you might use elsewhere works here on Tele2 Russia, Beeline Russia, MTS Russia, MegaFon Russia when listed. Land, turn data on, and go — rates for Russian Federation are shown live on this page because they can change.
Foreign visitors buy SIMs at airport kiosks with passport registration under migration rules; activation may include a short wait. Local numbers help with Yandex and domestic train apps. That still makes sense if you will live in Moscow for months and need local calls. For a holiday or short work trip, most people only need data — and NXTL gives you that without the desk stop: install at home, keep your usual number for calls and bank texts, pay only for the gigabytes you use.
If Russian Federation is one stop on a longer route, NXTL is built for that. Use data around Moscow and Saint Petersburg, then keep the same balance wherever NXTL has coverage next. You are not locked into a single-country tourist pack.
Trans-Siberian days between major cities cross time zones where your phone clock and cell registration both shift gradually. NXTL is built for that kind of Russian Federation trip: data when you need it, without buying a new pack for every change of plan.