I trained a neural network on my Android phone using Pydroid 3 — S-tier, 92% win rate, no servers

I wanted to see if my Android phone could train a real neural network. No cloud, no GPU, no TensorFlow — just Pydroid 3 and pure Python.

**The result:** A Q-learning neural network that reached S-tier in a fighting game and beat scientific algorithms.

**What it does:**

\- ⚔️ Fighting game: 81.2% win rate against 9 different bots (including Minimax)

\- ✊ Rock-Paper-Scissors: 92% against Exp3 and UCB1 (algorithms from research papers)

\- 🎭 Mafia (social game): 40% win rate (2x better than random)

**How it works:**

\- Pure Python lists and loops — no NumPy

\- Manual backpropagation (\~200 lines)

\- Replay Buffer (500 examples)

\- \~75 parameters, model size < 5 KB (JSON)

\- 10,000+ training battles on a phone

**Performance on Android:**

\- 500 fights: \~10 seconds

\- 5,000 RPS rounds: \~30 seconds

\- All trained locally in Pydroid 3

**Why this matters:**

You don't need a gaming PC or cloud GPU to experiment with neural networks. An Android phone is enough to train a working AI that beats algorithms from scientific papers.

Happy to answer questions about training on mobile!

GitHub in comments.

https://redd.it/1u8stc9
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Sony unveils the Lytia 910, its first LOFIC sensor, and it boasts 100dB dynamic range
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Daily Superthread (Jun 18 2026) - Your daily thread for questions, device recommendations and general discussions!

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Phones are about to get worse. - Android Police
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Any games that use the actual physical boundaries of an Android tablet?

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Android XR’s second device already looks interesting

Saw Project Aura and, weirdly, Android XR got a lot more interesting to me.
Not because I trust Google. I’ve been using Android since the Nexus days. I know the drill.
Glass died. Daydream died. Half of Google’s “future” platforms die. And now Android itself is getting more annoying with sideloading restrictions and AI bloat.
So yeah, I’m not exactly all-in on Google here.
But I do want Android XR to work.
Mostly because the alternative is Meta owning XR, and 🙄 that.
I never believed the whole “Horizon OS is opening up” thing. Meta’s version of “open” always feels like: open, as long as they still control the store, accounts, rules, and money.
That’s not Android. That’s just a cheaper walled garden.
Aura caught my eye because it’s not another Quest clone. It’s glasses + puck. Different shape, different use case, different assumptions.
That alone makes Android XR feel more interesting than Horizon OS to me.
Google can still screw this up. They probably will, in some very Google way.
But I’d still rather gamble on messy Android XR than let Meta own the whole category.
I don’t need Google to be perfect.
I just need them to be less Meta.

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Oppo Find X9 Ultra Review - $1,600 Enthusiast Import Trap - Drew Lipps
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Android 17 desktop also runs the Linux desktop

Hi,

We make a Debian based desktop distribution that runs as an application on top of any Android device. The only requirement is that the Android device needs to be rooted and use Google's standardized GKI kernel. The latest Android 17 release has excellent support for desktop mode and will be the basis for Googlebook laptops. Here is video of Linux desktop running on an Android 17 phone:
https://youtu.be/LD9A024yAgc?si=XmkvfRpmwv_Lsf7H

Our latest Linux desktop is now based on Debian Trixie (13.5). You can download a free evaluation version from www.volkspc.org.

VolksPC

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Select OnePlus phones gain dual Bluetooth audio streaming in the latest OxygenOS update
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How come back in the days (Android 2.3 - Cyanogen mod) I had much more possibilities than today?

I remember that my hotspot would show me all the connected devices and I could manage them. Today, I can't even see how many devices are connected to my Android hotspot.

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Everyone talks about Samsung, Google Pixel, and iPhone.

Which Android phone do you think deserves more attention than it gets?

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