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You'll have four options to choose from: System Default (Android) or System (iOS): Matches the theme to your operating system's current mode. If you want to send big files, Telegram has much of the competition beat with support for up to 2GB files. Meanwhile, WhatsApp’s limit is a measly 100MB, WeChat’s limit is also 100MB, and Skype’s limit is 300MB. Telegram files are also stored in the cloud, so you can access them from other devices. With the ability to send files up to 2 GB (or 4 GB), users can easily share large media items from other apps directly to Telegram on any mobile platform. This saves both time and storage space – so you don't have to save the file before sending it in Telegram.

The encryption is based on 2048-bit RSA encryption, 256-bit symmetric AES encryption, and Diffie–Hellman secure key exchange. Self Destruct Messages on Secret Chats Pin Messages in Channels Appearance section in Telegram

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