Block number of MTS in three ways:
Call MTS contact centre to number 8 800 333 08 90 or +7 495 766 01 66. This is the fastest way to block a number. In case of loss of phone is preferable to choose this option.
If you do not have a phone but have a computer and Internet access, you can block a number by going to "Internet assistant" on MTS site at The difficulty can occur if you have not previously applied to "web assistant", and you have no password, which requires your mobile phone.
Go to the nearest salon-shop of MTS, where the company's employees will block your number. In addition, the cabin shop you will be able to obtain free of charge new SIM card with your old number and balance on the account.