How to block your account in a telegram?

I lost the phone, the SIM card can not be recovered, can I block my account on which this phone number is indicated?

If you can not recover your number to which the telegram was registered. You need to contact support (how and where to contact you can read here), where administrators will try to help you, but the crux of everything is to restore the phone number.
Therefore, we advise you to apply to the office of your mobile operator, complete the application, after which the administrator will block the old SIM card and instantly issue a new one (service fee).

But while you all do not do this, it is likely that attackers from your phone can come in and use the information from your account telegrams. So put a password on your account to protect yourself.

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