To install an MP3 ringtone on an Android phone, you can install the free MP3 Cutter & Ringtone Maker app from the Google Play Store. Once the app is installed, launch it and you'll see a list of options. When you have downloaded the Redpill MP3 file on your smartphone, select MP3. Then go to Settings and tap on Sounds and Display to see the pasted MP3 file in your ringtones list