Twitter now allows users to pin tweets from iOS and Android devices. The process involves clicking on your profile, selecting the tweet, and using the three-dot menu to pin it. A video link is provided for visual guidance.

1. 5 Steps to Pinning your Tweets on iOS & Android Devices
Twitter now let’s users pin Tweets from their iOS & Android Devices.
Here is how to pin yourTweets.
1. Click on yourprofile.
2. Scroll down to the Tweet that you want to pin to your profile.
3. Click on the Tweet.
4. Click on the three dots on the top right hand corner of your screen.
5. Click on the drop down menu and click pin to yourprofile.
I have provided a link to the video provided by Twitter so you can visually see
the steps.