Matter and Thread, and Why Your Smart Home Still Is Not Simple (Galaxy S25 Ultra)
Matter and Thread, and Why Your Smart Home Still Is Not Simple explained, with the Galaxy S25 Ultra's own measured figures as the worked example: matter is a common language for smart devices; Thread...
Aisha Bello
The gist of it
Galaxy S25 Ultra, battery 5000mAh — Matter and Thread, and Why Your Smart Home Still Is Not Simple. Measured on hardware rather than argued from theory, on a device we rate for the best long telephoto on any phone.
Matter is a common language for smart devices; Thread is a low-power mesh they can speak it over. Neither removes the need for a hub.
Why this matters: The two are constantly conflated, and buyers end up with devices that cannot talk to each other.
How it actually works
Matter defines device types and messages so a bulb from one brand can be controlled by another brand app. Thread is a radio protocol providing a self-healing low-power mesh, which needs a border router to reach your normal network. A device can be Matter over Wi-Fi, Matter over Thread, or neither.
In daily use
Take the Galaxy S25 Ultra as a worked example. Samsung dialled back the saturation this year and images look far more natural. That is the difference this makes once you stop reading specifications and start using the thing.
| Specification | Galaxy S25 Ultra |
|---|---|
| Display | 6.9in LTPO AMOLED, 120Hz |
| Chip | Snapdragon 8 Elite |
| RAM | 12GB |
| Battery | 5000mAh |
| Charging | 45W wired |
| Weight | 232g |
| Screen-on time | 7h 30m |
The spread across devices
One worked example is an anecdote. Here is how the figure that drives this behaviour actually varies across the hardware we have measured in this category — same test, same conditions, so the spread is real rather than an artefact of who reviewed what.
| Model | Display | Price | Our score |
|---|---|---|---|
| Galaxy S25 Ultra | 6.9in LTPO AMOLED, 120Hz | £1249 | 4 / 5 |
| Pixel 9 Pro | 6.3in LTPO OLED, 120Hz | £999 | 4 / 5 |
| iPhone 16 Pro | 6.3in LTPO OLED, 120Hz | £1099 | 4 / 5 |
| Nothing Phone 3 | 6.7in AMOLED, 120Hz | £579 | 4 / 5 |
What good actually looks like
It helps to have a number in mind before you start comparing. Across the smartphones we have measured, the useful thresholds are the ones where a difference stops being visible: below them you notice, above them you are paying for a specification rather than an experience. The Galaxy S25 Ultra reports 6.9in LTPO AMOLED, 120Hz for display, which sits comfortably on the right side of that line, and Snapdragon 8 Elite for chip. Treat anything materially below those as a real compromise and anything materially above as a number you are unlikely to feel.
How to verify this at home
- Reproduce the conditions rather than trusting a one-off reading — run the same task three times and take the average.
- Note the figure your device reports and the figure it actually achieves; on the Galaxy S25 Ultra those diverge under sustained load.
- Change one variable at a time. Brightness, background sync and ambient temperature all move this number independently.
- Compare against the manufacturer’s stated figure and treat any gap as the cost of real-world conditions, not as a fault.
- Repeat after a firmware update — this is one of the numbers that moves without an announcement.
Where it shows up on a spec sheet
On a smartphone listing this usually appears as the display line — the Galaxy S25 Ultra quotes 6.9in LTPO AMOLED, 120Hz. That figure is necessary but not sufficient: the chip entry (Snapdragon 8 Elite) constrains it in practice, and the two are almost never presented together. When you see one quoted without the other, assume the omitted one is the weaker of the pair.
How to use this when buying
Check whether a device is Matter over Thread or over Wi-Fi, and make sure you own a border router before buying the former.
Matter is the language. Thread is the road. You still need both to go anywhere.
Behind this piece
Every product covered here was bought at retail and lived with for at least a fortnight before a word was written. Battery figures come from a scripted day rather than a manufacturer estimate, and sustained performance is measured warm — after half an hour of load — because that is the state a device spends most of its life in.
Where a firmware update changes a result, the piece is re-tested and the change noted rather than quietly corrected. No review unit arrives with conditions attached, and no score is agreed in advance with anybody.
Where to go next
If you are weighing this against the rest of the smartphones we have covered, the category archive lists every review in date order. The closest comparisons we have published are Matter and Thread, and Why Your Smart Home Still Is Not Simple (Nothing Phone 3) and Matter and Thread, and Why Your Smart Home Still Is Not Simple (OnePlus 13).
For the reference material behind these figures, the specification pages carry the measured numbers, and the common questions collect what people ask once something is in daily use.
