Unlike iOS, Android allows you to use third-party applications to perform important functions, such as subtitles. Here's how to set a new default subtitle app on your Android phone.
First, you need to install the replacement text program you want to use. There are plenty of SMS Apps on the Play Store. Textra SMS is a popular and what we should use as our example here.
After installing your text program, there are two ways to set it up as the default. You can do it from the app itself when you start the app for the first time or you can do it later via the device's setup app.
Set Texting App by default the first time you start it
Open the app and click past the initial startup materials (here we need to click "Start with Textra" and approve the necessary permissions).
When the app is launched, a button at the bottom asks if you want to make it your default app. Press the button and then press "Yes" to confirm.
And it is now your standard subtitle app. Almost all apps allow you to set them as default apps when you use them for the first time. For those who do not (or if you have used the app for a while and now want to set it as default), use the technique in the next section.
Set a Texting App by default in Settings  Start by going to the device settings.
There you have to look for a setting called Standard Apps. Since all manufacturers organize the settings differently, we recommend that you perform a search.
Inside the default application setting, click on the "SMS app" option.
You can see a list of all apps that support subtitles. Select the app you want to do by default (Textra in our case). You may see a message similar to the image in the picture below. If you do, press "OK".
Congratulations! You have successfully changed your default text caption application on your Android phone.
Image Credit: Noyna / Shutterstock