A few months ago, I had a conversation with my phone’s AI assistant about rescheduling a doctor’s appointment. Standard stuff. Then I started thinking about where exactly that conversation went.
Turns out: a server in a data center somewhere. Processed by a cloud AI. Potentially logged for quality improvement.
That bothered me more than I expected it to. So I spent a couple of weeks digging into every on-device AI setting available on my Android phone — and what I found was actually more capable than I assumed. You can run a lot of the AI features you already use without sending anything to the cloud at all.
Here’s the complete setup guide.
✅ Quick Summary
| Setting | Samsung Galaxy | Google Pixel |
|---|---|---|
| On-device mode switch | Settings → Galaxy AI → “Process data only on device” | Built-in via Gemini Nano / AICore |
| Required OS | One UI 6.0+ (Android 14) | Android 14+ |
| Works offline | ✅ Yes (most features) | ✅ Yes (core features) |
| What you lose | Generative Edit, Sketch to Image, Circle to Search | Complex Gemini queries |
| What you keep | Transcription, Live Translate, Writing Assist (basic), Call Assist, Scam Detection | Summarization, Smart Reply, Proofreading |
What “On-Device AI” Actually Means
Most people assume their phone’s AI is running on the phone. A lot of it isn’t.
On-device generative AI executes prompts locally, eliminating server calls. This approach enhances privacy by keeping sensitive data on the device, enables offline functionality, and reduces inference costs. Namu Wiki
The flip side — cloud AI — sends your voice, text, photos, or whatever you’re working with to a remote server for processing, then sends the result back. It’s faster and more powerful, but your data travels.
Most Android phones use a hybrid approach by default. Some tasks run on the phone’s chip. Others — especially anything visually or linguistically complex — go to the cloud. The on-device AI models handle privacy-sensitive tasks like processing your personal data or running Scam Detection during calls. Cloud-based AI models are used for heavier tasks like AI photo editing or complex agentic tasks. Truescho
The goal of this guide is to shift as much as possible to the on-device side — without breaking the features you actually use.
For Samsung Galaxy Users (One UI 6.0+)
Step 1: Check Your Device Is Eligible
Galaxy AI is available on the Galaxy S26 Ultra, S26+, S26, S25 series, S24 series, Z Fold7, Z Fold6, Z Flip7, Z Flip6, and many other models. Older Galaxy S21–S23 series and Z Fold3–Fold5/Flip3–Flip5 will require a software update to access Galaxy AI features. Nextplatform
To verify your OS version: Settings → About phone → Software information → One UI version.
You need One UI 6.0 or later. If you’re behind, update first: Settings → Software update → Download and install.
Step 2: Find the Galaxy AI Master Switch
This is the single most important setting in this entire guide.
Open the Settings app on your Samsung Galaxy phone. Scroll down and tap Galaxy AI. Then scroll to the bottom and turn on “Process data only on device.” Reviewinsight
That’s it. One toggle. Everything that can run locally will now run locally. Features that genuinely require cloud processing will either be disabled or prompt you before sending data out.
I tested this on a Galaxy S25 — the toggle takes effect immediately, no restart needed.
Step 3: Understand What Still Works
When I flipped that switch, I was half-expecting my phone to become useless. It didn’t.
Here’s what keeps working in on-device mode:
- Live Translate — real-time call translation, fully local
- Transcript Assist (basic) — voice to text, on-device
- Writing Assist (basic tone adjustment) — no cloud needed
- Call Assist / Scam Detection — Samsung’s Scam Detection uses on-device AI to flag potential scam calls with instant audio and haptic alerts, and this is processed locally for better privacy AI Ground
- Note Assist (basic formatting and summary)
- Health AI — Galaxy Ring and Watch health scores stay local
Step 4: Know What You’re Trading Off
If you turn on Galaxy AI on-device processing only, you’ll lose access to a few advanced intelligence features. Summarization and Sketch to Image functions are heavily reliant on online processing. Sireal
Specifically, these features go away or become limited:
- Generative Edit (removing/replacing photo objects)
- Sketch to Image (turning doodles into photos)
- Circle to Search — this one always needs a connection regardless
- Advanced cloud-powered summaries
For most people doing day-to-day tasks, the on-device mode covers more than enough. I ran on-device mode for three weeks straight and only missed Generative Edit once.
For Google Pixel Users
Pixel phones take a different approach. Gemini Nano runs in Android’s AICore system service, which leverages device hardware to enable low inference latency and keeps the model up to date. There’s no single master switch like Samsung’s — instead, on-device processing is baked into how specific features work. Namu Wiki
Which Pixel Phones Support Gemini Nano?
Pixel 9 series (9, 9 Pro, 9 XL, 9 Pro Fold) supports Gemini Nano-v2 with multimodal capabilities. Pixel 8 series (8 Pro, 8, 8a) also supports it, though the base Pixel 8 and 8a may require Developer Options to be enabled for some Nano features. Modulabs
What Gemini Nano Can Do On-Device
Gemini Nano handles summarization (condensing documents up to 3,000 words into bullet points, supporting English, Japanese, and Korean), Smart Replies with context-aware response suggestions that work in Google Messages, WhatsApp, and KakaoTalk via Gboard, and Rewriting to adjust tone and style. Selectstar
These all run without an internet connection. No data leaves the device.
The Honest Limitation
Gemini Nano has a significantly smaller context window than its cloud versions — approximately 2,048 tokens versus 1 million tokens in the cloud version. It’s not suitable for long document analysis. For complex multi-step reasoning tasks, the cloud version clearly outperforms Nano. Edraw Software
That’s a real constraint. If you’re trying to summarize a 20-page PDF on your Pixel, you’ll hit a wall. For shorter tasks — summarizing a news article, drafting a quick reply, proofreading a text — it handles things well.
On-Device vs. Cloud AI: When to Use Each
Here’s the practical breakdown I landed on after testing both modes:
| Use Case | On-Device ✅ | Cloud Needed ☁️ |
|---|---|---|
| Real-time call translation | ✅ | — |
| Scam call detection | ✅ | — |
| Short text proofreading | ✅ | — |
| Quick note formatting | ✅ | — |
| Voice to text (recording) | ✅ | — |
| Summarizing a long document | Limited | ✅ |
| Generative photo editing | ❌ | ✅ |
| Complex web queries | ❌ | ✅ |
| Sketch to image | ❌ | ✅ |
My personal approach: I keep the on-device toggle on by default, and temporarily switch it off when I specifically need something like Generative Edit. Takes about three taps and thirty seconds.
One More Thing: Turn Off AI Training Data Sharing
Even after enabling on-device mode, there’s a separate setting worth checking — whether your AI usage is being shared with Samsung or Google to train future models.
Samsung: Settings → Galaxy AI → scroll up → look for “Galaxy AI improvement program” or “Share diagnostic data” → toggle off.
Google Pixel: Settings → Google → More → Customize your Google AI features → turn off “Help improve AI features.”
AI features that are processed on-device don’t use your data for training machine learning models. Features that process data in the cloud may be used for model training. So once you’re in full on-device mode, this is less of a concern — but it’s still good practice to check. Brunch
If you want to go deeper on Android privacy settings in general, the Is Your Smartphone Spying on You? How to Audit App Permissions guide covers the full picture.
FAQ
Q. Does on-device AI work without Wi-Fi or cellular? Yes — that’s the whole point. On-device generative AI executes prompts locally, eliminating server calls, which enables offline functionality. As long as the feature is genuinely on-device, no network connection is needed at all. Namu Wiki
Q. Will enabling on-device mode drain my battery faster? Slightly, in some cases. Running AI inference on your phone’s NPU does draw power, but the difference is marginal for short tasks. Sustained heavy use — like long transcription sessions — will draw more. In my testing across three weeks, I didn’t notice a meaningful battery impact during normal daily use.
Q. My Galaxy phone doesn’t show the “Galaxy AI” option in Settings. What’s wrong? Two likely causes: your phone model isn’t Galaxy AI eligible, or your software isn’t updated. The One UI 6.1 software update is required to use Galaxy AI features. Go to Settings → Software update → check for updates first. IntuitionLabs
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