If you want to voluntarily block the SIM card for some time, call the information and referral service on 0500. Wait for a response consultant cellular company, then give me your passport details. After receiving the necessary information, the employee "Megaphone" will block your account. Note that the service is not free. Every month your account will be charged 30 rubles.
To disable a SIM card you can and using the system "Service-Guide". To do this, register in the system individual password, typing from your phone *105*00#. Wait for the response message with the password. Then in the address bar, enter the url of the website of OJSC "MegaFon", look for the words "Service Guide" and click it. Next you will see the cells, enter a phone number and received the message password. After you have logged in the account, find the menu (it is located on your left). Select the "Services tariff". In the list that appears, click on "Lock." Here, specify the period of voluntary disconnection of the SIM card. Click "Install". Note that the lock number is available for the term period of 180 days.
Voluntarily block the SIM-card you can and with the help of a consultant. To do this you need to approach the nearest office of the operator or his representative. With them you have to have a passport. The technician will ask you to write a statement. After this within few hours your account will be blocked for the specified time.
If you want to disable the SIM card permanently, that is, to terminate the agreement of rendering of communication services, visit the office of the company. Only in this case you can block the SIM card permanently. For blocking numbers in this case are not charged.