To block your SIMcard via the Internet is possible only in the case if you've used personal account on the official website of "Beeline" and you have the access password. In the absence of the password, you can get it for free by sending a request to a command *110*9#, but if you lost the phone then it will be impossible. In this situation, you should contact the customer Service of "Beeline" on number 0611 mobile phone, or by calling (495) 974-88-88 from a landline.
If you have previously used your personal account and you have the password, log into office, using as login your mobile phone number in ten-digit format. On the main page in the section "Information about your room, click the link "Block" to the question "Block of rooms?" reply positively by pressing the Yes button. The SIM card will be blocked.