[BRLTTY] getting a command shell on android

[Rob]

Hi there,
I have here an Android phone. Because I find the TTS it comes with a little hard to understand, I need to get Brltty installed asap. 
The phone doesn't appear to come with any sort of file manager and I can't navigate the onscreen keyboard to sign into google to purchase one.
How can I get into a command prompt on Android to install the Brltty app? It's based on Linux, so there has to be one somewhere. Right?
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