Assume that you have not changed the tariff from the date of purchase of the SIM card. Then it must be specified in the contract.
If you changed the rate, and that repeatedly, a good way to learn the current tariff plan will be set in the phone rooms *110*05# and call. This combination is free for subscribers of "Beeline". In response after 2-3 minutes you will receive an SMS-message, which will indicate the plan name, and the date of connection and what region has developed this plan.
Also a good way call the call center of the company "Beeline" to the short number 0611. This call will not be charged, absolutely free. Your call will be answered by the operator or Manager "Beeline". Ask him what is currently on your SIM card, tariff plan, explaining that you are often put it is called just "dropped you out of my head".