Mighty African explains [1] how he discovered a tool to help him use Ghanaian characters on Android phones:
Earlier today, I was looking to type something in Twi on my phone so I needed ɛ and ɔ characters so I proceeded to Nyamfowa.com to copy them and use. And then it dawned on me, the Kasahorow folks were working on a keyboard to allow typing these Ghanaian characters on Android.