Telegram-FOSS (the FOSS friendly fork you can find on F-Droid, not the official app on Play Store) maintainer here. Telegram is NOT a "secure messaging app".
After all these years and promises, server's code is still closed, federation is nowhere to be found, their update/commit policy for the official Android app is a joke [1] (they even closed its issue tracker), and I'm really tired of their "trust us, we're not evil" policy [2].
If you haven't switched to Matrix/Riot, do it right away.
[1] https://github.com/DrKLO/Telegram/commits/master
[2] https://telegram.org/faq#q-who-are-the-people-behind-telegra...
It appears to be like IRC, but also integrates with Gitter, and IRC and has a identity federator called vector.im.
Riot is a client. It used to be named Vector.im.