text model · Phi-4 · Android

Can I run Phi-4-reasoning on Samsung Galaxy S25 Ultra (16GB, 1TB config only)?

Compatibility verdict VRAM threshold engine

Yes, it runs slow on this hardware ~5 tok/s est.

Yes. Phi-4-reasoning runs on Samsung Galaxy S25 Ultra (16GB, 1TB config only) at Q4_K_M (~10.1 GB of ~12 GB usable).

Needs ~10.1 GB Device usable ~12 GB

Runs at Q4_K_M using ~10.1 GB of ~12 GB usable.

That figure is at a 4k context and moves about ±15% as context length changes. Samsung Galaxy S25 Ultra (16GB, 1TB config only) leaves ~1.9 GB of headroom.

Q4_K_M needed: ~10.1 GB
Usable on device: ~12 GB
Device memory: 16 GB
Best quant: Q4_K_M

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Which quant fits

Quant ladder vs ~12 GB usable

Q2_K

~7.6 GB

Q3_K_M

~8.5 GB

Q4_K_M

~10.1 GB

Q5_K_M

~11.7 GB

Q6_K

~13.2 GB

Q8_0

~16.2 GB

FP16

~31 GB

The line marks Samsung Galaxy S25 Ultra (16GB, 1TB config only)'s ~12 GB budget; rungs past it are too large.

Running cost · estimate

Power & economics est.

Power draw: ~8 W
Electricity / 1M tokens: ~$0.07
Pays for itself after: ~3,765M tok

At ~$0.15/kWh and the estimated ~5 tok/s, a million generated tokens costs about $0.07 in electricity. Versus a hosted API at ~$0.5 per million tokens, the ~$1,619 Samsung Galaxy S25 Ultra (16GB, 1TB config only) pays for itself after roughly 3,765 million tokens, so local hardware is mostly a fixed cost, not a per-token one. TDP is the peak draw, so this is an upper bound. Assumptions.

How to run it

On Android use PocketPal AI (Polished app, download GGUF and run offline.).

Model Phi-4

Parameters: 14B
Q4_K_M size: 8.43 GB
Q8_0 size: 14.51 GB
Context: 32k
Ollama tag: phi4-reasoning:14b

Full Phi-4-reasoning requirements →

Device Android

Memory: 16 GB ram
Usable for weights: ~12 GB
Power draw: ~8 W
Best runtime: llama.cpp (PocketPal) or MLC-LLM (Adreno GPU path)

Best models for Samsung Galaxy S25 Ultra (16GB, 1TB config only) →

You could also run

Run Phi-4-reasoning on other hardware

Nvidia GeForce RTX 3060 (12GB)Nvidia GeForce RTX 4070 (12GB)Apple M2 (16GB)Apple M4 (16GB)Nvidia GeForce RTX 4060 Ti (16GB)Nvidia GeForce RTX 4080 (16GB)

FAQ

Can Samsung Galaxy S25 Ultra (16GB, 1TB config only) run Phi-4-reasoning?

Yes. Phi-4-reasoning runs on Samsung Galaxy S25 Ultra (16GB, 1TB config only) at Q4_K_M (~10.1 GB of ~12 GB usable).

How much memory does Phi-4-reasoning need?

Samsung Galaxy S25 Ultra (16GB, 1TB config only) has room to spare. At Q4_K_M the weights are ~8.43 GB; with KV cache and runtime overhead, budget ~10.1 GB at a 4k context.

What is the best tool to run Phi-4-reasoning on Android?

On Android, PocketPal AI (Polished app, download GGUF and run offline.) is the go-to option. NPU acceleration is limited and chip-specific; most apps run on CPU. Expect 1B-4B class.

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Markdown

[![Phi-4-reasoning on Samsung Galaxy S25 Ultra (16GB, 1TB config only)](https://localmodel.run/badge/phi-4-reasoning/samsung-s25-ultra-16gb.svg)](https://localmodel.run/can-i-run/phi-4-reasoning/samsung-s25-ultra-16gb)

Sources

Weights are measured from GGUF files; KV cache and overhead are computed, so totals can vary ~15% with context and runtime. Any tok/s is a bandwidth estimate. See methodology.