Between the Phone (3a) and MIX Fold 4, the Phone (3a) comes out ahead in front camera and weight, while the MIX Fold 4 wins on antutu and ram. Overall, the Phone (3a) scores 62.5 and the MIX Fold 4 scores 71.4 on our Mars Score.
Which should you buy?
The MIX Fold 4 is the clear pick on raw spec strength, leading by 8.9 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Phone (3a) if you photograph or shoot video regularly and want the better imaging pipeline of the two. The biggest gaps in its favor are front camera, weight.
Pick the MIX Fold 4 if you push the hardware — gaming, on-device AI, heavy multitasking — and the extra compute headroom is worth the trade-offs. Its strongest claims are antutu, ram, wired charging, among others.
Both ship with comparable main camera, refresh rate, 5g support, so those specs don't separate the two — focus on the differences below.
Bottom line: the MIX Fold 4 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Nothing - Phone (3a) wins
- ▲Front camera — 60.00% more. 32 MP vs 20 MP.
- ▲Weight — 25.00 g less. 201 vs 226.
Why Xiaomi - MIX Fold 4 wins
- ▲AnTuTu — 148.78% more. 2040000 vs 820000.
- ▲RAM — 100.00% more. 16 GB vs 8 GB.
- ▲Wired charging — 34.00% more. 67 W vs 50 W.
- ▲Screen size — 17.87% more. 7.98 " vs 6.77 ".
- ▲Pixel density — 3.88% more. 402 ppi vs 387 ppi.
- ▲Battery capacity — 2.00% more. 5100 mAh vs 5000 mAh.
- ▲Water resistance: IPX8 (vs IP64).
- ▲Promised OS updates: 4 (vs 3).
Spec comparison
Design
| Spec | Nothing - Phone (3a) | Xiaomi - MIX Fold 4 |
|---|---|---|
| Weight | 201 glead | 226 g |
| Thickness | 8.4 mmlead | 9.47 mm |
| Water resistanceⓘ | IP64 | IPX8lead |
| Form factor | bar | foldable_booklead |
Display
| Spec | Nothing - Phone (3a) | Xiaomi - MIX Fold 4 |
|---|---|---|
| Screen sizeⓘ | 6.77 " | 7.98 "lead |
| Pixel densityⓘ | 387 ppi | 402 ppilead |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 3000 nits | 3000 nits |
Performance
Cameras
| Spec | Nothing - Phone (3a) | Xiaomi - MIX Fold 4 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MPlead | 20 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Nothing - Phone (3a) | Xiaomi - MIX Fold 4 |
|---|---|---|
| Battery capacity | 5000 mAh | 5100 mAhlead |
| Wired chargingⓘ | 50 W | 67 Wlead |
| Wireless chargingⓘ | 0 W | 50 Wlead |
Connectivity
| Spec | Nothing - Phone (3a) | Xiaomi - MIX Fold 4 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Nothing - Phone (3a) | Xiaomi - MIX Fold 4 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 3 years | 4 yearslead |
Frequently asked
Which has better battery, Phone (3a) or MIX Fold 4?+
MIX Fold 4 has 2.0% more battery — 5000 mAh vs 5100 mAh.
Which is lighter, Phone (3a) or MIX Fold 4?+
Phone (3a) is 25g lighter — 201g vs 226g.
Is Phone (3a) waterproof?+
Phone (3a) has an IP64 rating.
Does MIX Fold 4 support 5G?+
Yes, MIX Fold 4 supports 5G.
Which has more RAM, Phone (3a) or MIX Fold 4?+
MIX Fold 4 offers 16GB of RAM.
Which has a better camera, Phone (3a) or MIX Fold 4?+
MIX Fold 4 has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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