St. Petersburg - Moscow: GPRS and not only

Business ties between Moscow and St. Petersburg have become closer, thousands of people several times a month, full-time in the car, bus or train car. Fritter it all the time to read magazines - a luxury, it is wiser to do something useful. Meanwhile, on that on ordinary days are always short of time: in the end to answer non-urgent letters and thoughtful understanding of news, etc. How much is efficient mobile access to the Internet and can count on him during the trip?