Tor in termux:

Install termux from playstore or fdroid.

Run these commands in termux:

$ curl -LO https://raw.githubusercontent.com/mhdzli/tormux/main/tormux.sh
$ bash tormux.sh install
$ tor &

Set socks proxy for telegram:

1. Go to settings > Data and Storage > Proxy Settings.
2. Tap on Add Proxy
3. Set the Server to 127.0.0.1 and port to 9050

If Tor didn't connect to existing bridges:

1. Send an email with empty subjec field and "get transport obfs4" in content to bridges@torproject.org to get new bridges (Just works with Gmail and Riseup). Alternatively you can get new bridges from torproject website.
2. Replace exicting bridges in obfs.txt in downlods directory of your internal memory with new ones.
3. Run bash tormux update in termux
4. Run tor &

To stop tor just run pkill tor in termux