Can Gemma 4 E2B run on iPhone 15?
YES — Runs, barely
Grade B · 61/100 · formula estimate
What this means
The checked IQ4_XS version should run, but there is very little memory left for the operating system and other apps. The smaller Q3_K_M version is the safer choice.
Download the Q3_K_M version, which is about 2.5 GB. We expect it to use about 3.4 GB of the roughly 3.9 GB available to a model on this phone.
At the estimated speed, a roughly 300-word answer may take about 43 seconds to finish.
This result is calculated from the phone and model specifications. It has not been measured on this exact phone and setup.
7.7tokens/s
estimated · reading pace
3.9GB
needed at IQ4_XS
IQ4_XS
quant checked
B
grade · 61/100
needs 3.9 GBusable 3.9 GB
Apple A16 Bionic6 GB RAMMetal
Make it bearable
1
Drop to Q3_K_M (2.5 GB) — it runs comfortably here at ~9.2 tokens/s. Recommended over IQ4_XS.
2
Drop context to 2K — saves ~0.1 GB of KV cache and a little speed.
3
Close every other app before loading — the 0 GB headroom is real; iOS may evict the model otherwise.
4
Expect throttling after ~10 min of sustained generation on a phone chassis.
See how fast it feels
Estimated at 7.7 tokens/s — reading pace. A ~300-word reply takes about 52 seconds on this phone.
Where the memory goes
| Component | Detail | GB |
|---|---|---|
| Model weights | IQ4_XS GGUF (3 GB) + mmap overhead | 3.2 |
| KV cache | 4K context window | 0.1 |
| Runtime | llama.cpp + app overhead | 0.6 |
| Total needed | at IQ4_XS, 4K context | 3.9 |
| Usable on iPhone 15 | 6 GB RAM − iOS reserve (jetsam limit) | 3.9 |
| Headroom | left for the OS and your other apps | 0 |
Pick your quant
| Quant | Download | Verdict | Speed |
|---|---|---|---|
| Q3_K_M BEST HERE | 2.5 GB | ✓ Runs great | ~9.2 tokens/s |
| IQ4_XS | 3 GB | ! Runs, barely | ~7.7 tokens/s |
| Q4_0 | 3 GB | ! Runs, barely | ~7.7 tokens/s |
| Q4_K_S | 3 GB | ! Runs, barely | ~7.7 tokens/s |
| Q4_K_M | 3.1 GB | ✕ Won't fit | won't fit |
| Q5_K_M | 3.4 GB | ✕ Won't fit | won't fit |
| Q6_K | 4.5 GB | ✕ Won't fit | won't fit |
| Q8_0 | 5 GB | ✕ Won't fit | won't fit |
Get it running in 3 steps
1
Install PocketPal from the App Store — free, no account needed.
2
Download "Gemma 4 E2B Q3_K_M" in the in-app model hub — 2.5 GB, use Wi-Fi. Search Hugging Face for
unsloth/gemma-4-E2B-it-GGUF and pick the Q3_K_M file.3
Set context to 4K and enable Metal — expect ~9.2 tokens/s on this phone.
Related checks
MORE ON IPHONE 15
GEMMA 4 E2B ON OTHER PHONES