Globally known taxi service Uber have came to Sochi one day. It is a fast way of the taxi order. You just need to instal the Uber app and register there. The payment will be carried out by the credit card, linked to the account or by cash. It depends on the distance and the time of the trip according to the current tariff. You can previously calculate it on your own.
We would like to note, however, that taxi apps in Sochi work in a special way. The competition with local private drivers is too high. So be prepared that Uber just will not be able to serve you on some adresses.