Serial read through mobile phone

[jimini]

Here's my experience attempting OTG serial with Android:

USB Android Serial

It’s really hit or miss whether OTG works or not. I wrote that section of the Serial Tutorial using a Moto G3 running Marshmallow 6.0. I tried a few other serial programs before getting Android USB Serial Monitor Lite to work, so you very well may find one of the others work better on a different phone/OS version.

I've yet to try other apps to get this operational.