While Twitch has been predominately used by PC or console gamers, you do have the option to stream from your Android phone. And with some bigger titles — like Fortnite, PUBG, and Call of Duty — available for mobile, there's really no reason not to start streaming from your phone, especially if you're using a flagship released in the last few years.
YouTube
Although YouTube Gaming used to be here in this guide, due to Google sunsetting the Android app last year, we had to make some updates. Gaming's features were wrapped into the main YouTube app, including the option to stream from your phone.
However, with this change came a large barrier to entry for most people. See, YouTube now requires you to have at least 1,000 subscribers in order to stream from your mobile device. It's an unfortunate change, since YouTube Gaming used to be one of the best ways to get up and going when it comes to streaming your Android games.
Method 1: OBS
For starters, the Twitch app for mobile does not currently let you stream games from your phone to your Twitch account. That feature will hopefully be added sometime down the line, though it's seeming less likely by the day. For the moment, the app does allow you to stream "IRL" using your phone's camera and microphone, so if you want to use Twitch as a vlogging platform or simply want to watch your favorite twitch streamers, the Twitch app is a great option.
Method 2: Streamlabs
While the above method works, there is an easier option. If you're into streaming already, then you've probably heard about Streamlabs. If you're not aware of it, the gist is that Streamlabs is an impressive tool that is 100% focused on making streaming easy and fun with powerful additions to what makes OBS great.