The Apple Watch Series 3 42mm was launched in 2017 and had a remarkably long commercial lifespan — Apple kept it in its catalogue until 2022, when it was finally discontinued. In 2026, eight years after launch, the honest answer to whether it's still worth buying is: it's at the end of its useful life. Apple stopped updating it (last official watchOS: 8.x), and newer models offer dramatically more. That said, there are very specific scenarios where it makes sense — this guide explains them.
In this article
- Apple Watch Series 3 42mm Specifications
- Why the Series 3 isn't worth it in 2026
- Who it might still suit
- Series 3 vs alternatives in 2026
- What to check if you decide to buy a Series 3
- Setting up a Series 3 in 2026
- When to move to a newer model
- Frequently asked questions
- Does the Series 3 still receive updates?
- Can I use ECG?
- Is it good for swimming?
- Does it work with any iPhone?
- What are iOutlet's delivery and warranty terms?
For 99% of users looking to enter the Apple Watch ecosystem in 2026, a refurbished Apple Watch SE 44mm or Series 6 from iOutlet makes far more sense, with a direct 24-month warranty and a battery tested with specialist technical software.
Apple Watch Series 3 42mm Specifications
- Size: 42mm
- Case: aluminium (Space Grey, Silver, Gold)
- Display: OLED Retina, 312×390, 1000 nits
- Chip: S3 dual-core (first dual-core chip in the line)
- Storage: 8GB
- Battery: up to 18 hours under normal use
- Water resistance: WR50 (50 metres)
- Connectivity: GPS or GPS + Cellular, Wi-Fi (802.11b/g/n), Bluetooth 4.2
- Sensors: optical heart rate (1st gen), accelerometer, gyroscope, ambient light sensor, barometric altimeter
- watchOS supported: officially up to watchOS 8.x (released in 2021). No updates since 2022.
Why the Series 3 isn't worth it in 2026
- No watchOS updates — stuck on watchOS 8 since 2021. No recent security patches.
- Modern apps don't work — many App Store apps now require watchOS 9+ as a minimum.
- No ECG, no SpO2, no Always-On — features introduced on later models.
- 1st-generation heart rate sensor — less accurate than current ones.
- Ageing battery — any Series 3 still in circulation will have a significantly degraded battery.
- No fall detection — a feature introduced with the Series 4.
- Sluggish performance — apps open noticeably slowly, animations stutter.
- Small 42mm display — current models have 44mm/46mm screens with reduced bezels.
Who it might still suit
- First Apple Watch at a near-token price — to try before investing in a recent model.
- Very basic use — just checking the time, simple notifications, and casual workouts.
- Supervised children — with parental controls via Family iPhone.
- Collectors / nostalgia — iconic design from the early days of the Apple Watch line.
For any other use case — real daily use, fitness, health, safety, long-term value — it's far better to jump to a refurbished Apple Watch SE 44mm, Series 6, Series 7, or Series 8 from iOutlet. See all available refurbished Apple Watch options.
Series 3 vs alternatives in 2026
| Model | Chip | Always-On | SpO2/ECG | watchOS |
|---|---|---|---|---|
| Apple Watch Series 3 42mm | S3 | No | No / No | watchOS 8 (final) |
| Apple Watch Series 4 44mm | S4 | No | No / Yes | watchOS 10 (final) |
| Apple Watch SE 44mm | S5/S8/S10 | No | No / No | watchOS 12 (current) |
| Apple Watch Series 6 44mm | S6 | Yes | Yes / Yes | watchOS 12 (current) |
| Apple Watch Series 8 45mm | S8 | Yes | Yes + temp / Yes | watchOS 12 (current) |
What to check if you decide to buy a Series 3
- Don't pay more than €50–100 — units at this price in decent condition are already rare.
- Healthy battery — check under Settings → General → Battery → Battery Health. Replacement costs are high relative to the watch's value.
- Activation Lock — confirm it's unlocked from the previous Apple ID.
- Updated to watchOS 8 — the most recent version possible.
- Strap — all 42mm/44mm/45mm/46mm Apple straps are compatible.
Setting up a Series 3 in 2026
- Turn on the Apple Watch and bring it close to your iPhone (running iOS 14+ — more recent versions may cause issues).
- Confirm the pairing on your iPhone via the Watch app.
- Sign in with your Apple ID; choose to set up from scratch or restore from a backup.
- Enable the notifications you want to receive.
- Configure watch faces, complications, and Do Not Disturb.
When to move to a newer model
I strongly recommend moving to at least a refurbished Apple Watch SE 44mm if: you want to use the watch daily over the next 2–3 years, you care about health features (accurate heart rate, fall detection), modern apps, or simply a smooth experience. The price difference in refurbished is usually small for the years of usefulness you gain.
Frequently asked questions
Does the Series 3 still receive updates?
No. Apple removed the Series 3 from its list of supported models in 2022. watchOS 8 is the last version. In 2026, it has gone four years without patches.
Can I use ECG?
No. ECG was introduced with the Series 4. The Series 3 has only a 1st-generation optical heart rate sensor.
Is it good for swimming?
Yes, WR50 — suitable for pools and the sea. Not for deep diving.
Does it work with any iPhone?
It works with iPhones running iOS 14+ (iPhone 6s or later). On more recent iOS versions, there may be limitations when pairing or setting up — on some iPhones running iOS 18+ the setup process may fail.
What are iOutlet's delivery and warranty terms?
Free delivery within up to 8 working days to mainland Portugal. 24-month direct iOutlet warranty on refurbished items, with full coverage (including battery). 14 days to return, no questions asked.
Ready to upgrade? See all refurbished Apple Watch options available at iOutlet, all with a direct 24-month warranty, battery tested with specialist technical software, and free delivery within up to 8 working days. Also check out our refurbished iPhone range to pair it with.
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