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Pros
Pro Let's you forward messages without quoting
Pro More tabs
Plus Messenger sorts all your conversations into multiple tabs for easier navigation.
Pro Tabbed view
Lets you have multiple tabs for personal chats, groups, channels, bots etc
Pro Go to first message supported
The feature to go with one click to the very first message of the chat instead of having to scroll up a lot is supported.
Pro Themeable
Different themes to choose from in order to personalize how the app looks.
Pro Message details
For example - see the exact size of the message - be it a file like a video or a simple text message. Or see the exact timestamp with the year and milliseconds included.
Pro Schedule message for when online
Ability to schedule the message to send when the receiver is online
Pro Select all chats option
You can select all chats by pressing one button.
Pro More icons showing as options
There is less of a need to press on the 3 dots to reach more features because more of them are already shown.
Pro Delete from cache directly from the file (video/voice/PDF)
Choose which files to delete from the cache directly from the file, for example, if you have one specific big video you want to delete from the cache this is possible.
Pro Private links to messages
Generate private links to messages, these links only work if you have access to the chat.
Pro Can apply saved themes
Pro Save original filenames
Able to download and save filenames with their original mame
Pro Presence icon in chat list
Shows presence based on last seen directly from the chat list with an icon. (green, light grey, dark grey, black).
Pro Add to home screen
Add chats to home screen from, even a few in go (batch adding).
Cons
Con New features on Telegram take time to roll out
Sometimes rolling out the new features takes time.
Con Not privacy friendly
Con Old API
Telegram doesn't use the latest API.
Con Buggy
There might be more bugs on this version on particular devices - there is no concrete proof of this.
Con No option to ignore messages from blocked contacts in group chats
For example, nekogram has this useful feature.