best-secure-messaging-apps-shutterstock-1892950018.jpg Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.” The best encrypted messaging apps The Channel name and bio must be no more than 255 characters long The optimal dimension of the avatar on Telegram is 512px by 512px, and it’s recommended to use PNG format to deliver an unpixelated avatar.
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