here is cooking a kutegram a client for open source symbian. matvei Tkachuk is the developer of this app for symbian os, excellent old operating system but super cool.
Kutegram chat,project of telegram for symbian os: https://t.me/kutegramchat
Channel: https://t.me/kutegram
Website: http://kg.curoviyx.ru
Github:
https://github.com/kutegram