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To use this feature, head over to the hamburger menu by swiping right and choose Contacts. Choose ‘Find People Nearby’ and here you will see a list of contacts who have chosen to be visible. You can also scroll down to see all nearby groups and the option to create your own. Users who wish to be discovered by this feature can turn it on in the hamburger menu/People Nearby/Make myself visible. In fact, Telegram has solved the issue with its Secret Chat feature. Take Advantage of Telegram Chat Tools

What makes Telegram unique is its focus on privacy, encryption, and an open-source API. There are countless unofficial clients to go along with the official Telegram apps and web interface. It also allows multiple devices to use the same account (verified by SMS), and multiple accounts on the same device. Telegram Cloud Save for Notifications Verification Badges in Chats

Do you enjoy using both light and dark modes? Telegram has an auto-night feature so the app doesn't blind you at night. To create one of these, go to Settings or a Chat Info page, click Edit > click the Profile Picture > select Sticker or Emoji. To lock a chat go to Settings->Privacy and Security->Passcode Lock and enable it. Once you create a passcode and enable it, you will be able to lock and unlock your chats by tapping on the lock icon at the top right of the app. Keep Alive

According to the official Telegram FAQ section, You can create secret chats that use end-to-end encryption. This means only you and your chat partner can read those messages. Color-theme of the app