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. Telegram

Owners of public groups can enable join requests via Group Info > Edit > Group Type > Who Can Send Messages > select Only Members > enable Approve New Members. In fact, Telegram supports verifiable builds that allow outside developers to check whether the code published on GitHub is the exact same code that is used to create the app, which you have downloaded from Google Play or App Store. To do this, head over to Telegram’s settings by sliding over the hamburger menu from the left of the app. Here, choose ‘Settings’ and then click on ‘Chat Settings’. In this menu, you will see a number of themes and colour options to choose from. Further, you can also change the curve on message boxes and font size.

Auto-download and Auto-play Media For maximum privacy, you can create secret chats that use end-to-end encryption. These aren't stored on Telegram's servers, so you can only access them with your specific phone. If one party deletes a message, it disappears on both devices. And you can specify a self-destruct period for all media if you like. This is a handy feature for users who want to save disk space. To access it, go to the “Settings”, “Data and Storage”, and then tap “Storage Usage”. You will find four options: keep media on your device for three days, one week, one month, or forever. Telegram has a unique feature called Channels that allow you to broadcast messages to large audiences. Unlike Groups, Telegram Channels can have an unlimited amount of subscribers, and only admins have the right to post content.

Edit Photos/Videos Before Sending Them Telegram offers a few other handy options in chats. You can delete any message by long-pressing it, then hitting the Trash icon that appears. The app lets you delete messages at any time—even messages that the other person sent in a chat. If you're verified on at least two social networks, you can verify your group, channel or bot. Telegram Cloud

Auto-Night Mode Let’s say you have enabled the “Slow Mode” and set an interval of 1 minute. Now members in the group can only send one message per minute. A timer will show them how long they have to wait before sending the next message.