To find out the balance of the account numbers belonging to the operator "MTS", you need to dial *100# or #100#, depending on your phone model. Request free of charge. The amount of money in the account will be displayed. To make a call you need to be in the range of a network.
Also you can check the account status and other data about the number using the service "Internet Assistant". Activate it by typing on your mobile phone *111*23#. Following the voice prompts, select the password numbers (4 to 7).
Enter your account manage the service using the number (without the eight) as username, and the password set on the phone as the password. On the page management tab, select the menu item "Account", then "account Status". The remaining balance will be displayed on the page.