If you have a big-box electronics store in your ara, you can probably buy a very inexpensive Android cell phone (new) for $40-$80 .
My local bigbox is called Fry's Electronics, and they have BLU phones (several models) between $45-$60. Now these are last-generation technology (or maybe even 2 generations back) but the $60 version does specify Android 8.0, 5" screen, Quad-core processor (newer, better phones are now 6 or 8 cores), and a 5MP camera. The cheaper ones are 4" screens.
I am suggesting this as a device to read your OBD, not as your new cell phone. It costs about the same as a decent OBD reader.
I have no connection to BLU - they were just the cheapest unlocked phones that Fry's had.
Edit: I just checked on Amazon, and the cheapest BLU they had (unlocked) was $99. But it's a much better phone than the ones I saw at Fry's. But Amazon also has new, unlocked Android phones starting around $50 from other vendors.