If someone else logged into your account, you will see their session in the list. Most likely, an unusual device and IP address will be noted there. The login location will also be geographically different from your location.
If your suspicions are confirmed, you should take care of the cloud password. This is the same security tool as in social networks and email. The password will need to be entered every time you log into Telegram from a new device.
Here's what you need to do to install it:
open settings;
select the "Privacy" item;
Click on the "Cloud Password" item.
The messenger will offer to set a hint or an email for recovery. Both turkey mobile database methods have drawbacks. You can use as a hint something that no one can know except you. But after years, there is a risk of forgetting what exactly you wrote and how you formulated it. At the same time, the email for recovery may be less secure. If hackers hack it, they will be able to access your account in TG.
How to protect your account
The actions of fraudsters in Telegram have to be stopped very quickly. It is unknown what damage they will manage to cause during this time. Therefore, it is better to take care of protecting your account in advance.
First, it's worth setting up a cloud password, which we described above, and checking the list of sessions from time to time. There are several other ways to strengthen the protection.
Be aware of where you are asked to log in
Some resources request authorization via Telegram. Make sure you need it at all. Check that the site is safe for authorization, because such a request may be a scam.
Install antivirus
This point may seem simple. But links to antiviruses can lead to malware. Check that the download address matches the official website of the manufacturer.
Disable autoload in the application
This feature can be convenient in certain circumstances. However, uncontrolled file downloads sometimes lead to the device being infected with viruses.
To disable autoload, you need to do the following:
go to "Settings";
select "Data and storage";
Uncheck all boxes in the automatic file download section.
Check all downloaded files and their sources. The file extension should match what you expect. For example, e-books should not be executable. Try not to download files to your device unless you have antivirus software installed.