Android Keyboard App to give you a keyboard you can use to type in many languages in Nigeria. (Built with KeyMan and Keyboard App Maker.)
Install the app (say Yes or Install past all the scary warnings) and activate the keyboard, then press and hold to show variations of certain letters. Then slide over to the relevant key. Don’t lift your finger between pressing the key and moving to the one you want. Whatever is highlighted when you lift your finger will be typed.