How to Connect OnePlus Watch 3 to Your iPhone.
Yes. The OnePlus Watch 3 works with iPhone. OnePlus supports Android only, so pair it with Lynio instead and you get calls, notifications, contacts and health sync in about 3 minutes. See how
A 648mAh battery, five days between charges, a 2,200 nit screen, and the best rotating crown on any Wear OS watch.
About the OnePlus Watch 3
Released March 2025 at around $329, and the battery champion of this directory. The 648mAh cell is the largest here, and OnePlus rates it at up to five days in smart mode or 16 days in power saver, with ten minutes on the charger buying a full day.
It manages that with a dual-chip design: a Snapdragon W5 Gen 1 runs Wear OS, and a separate BES 2800 microcontroller handles the low-power work. The 2,200 nit LTPO display is the brightest non-Samsung screen here, the case is stainless steel with a titanium alloy bezel and sapphire front, and the rotating haptic crown at two o'clock is widely rated the best physical control on any Wear OS watch.
Two honest limits. There is no LTE version. And the ECG sensor is present but switched off in the US and Canada, because OnePlus does not have FDA or Health Canada clearance. OnePlus does publish a support window, which most brands here do not: three years of operating system updates and three years of quarterly security patches, 2025 to 2027.
A 43mm version arrived in July 2025 at 36.8g with a 1.32in screen.
| Case | 47.6 x 46.6 x 11.8mm, stainless steel with a titanium alloy bezel, 49.7g |
| Front | Sapphire crystal |
| Display | 1.5in LTPO AMOLED, 466 x 466, 2,200 nits |
| Chip | Dual chip: Snapdragon W5 Gen 1 plus a BES 2800 microcontroller |
| Memory | 2GB RAM, 32GB storage |
| Battery | 648mAh. Up to 5 days smart mode, up to 16 days power saver |
| Charging | 10 minutes for a full day |
| Durability | 5ATM, IP68, MIL-STD-810H. Rated minus 40C to 70C |
| Cellular | None. No LTE or eSIM version |
| Bluetooth | 5.2. Wi-Fi dual-band |
| GPS | Dual-band L1 and L5, five systems |
| Sensors | Heart rate, SpO2, skin temperature, barometer, compass. ECG present but disabled in the US and Canada |
| Play Store | Yes, full Google Play on the watch |
| Software | Shipped Wear OS 5. Three years of updates committed, 2025 to 2027 |
Connect in 3 Steps
Install Lynio Watch on your OnePlus Watch 3
From the Play Store on the watch. If Google sign-in will not work there, Lynio sends the app across as a signed bundle over Wi-Fi instead.
Follow the in-app pairing guide
Keep both on the same Wi-Fi, Bluetooth on, and leave the app open until pairing finishes.
What You Get After Pairing
| Works | Does not carry over |
|---|---|
| Notifications from your iPhone | The OHealth phone app and its history |
| Calls, made and answered from the wrist | Google Wallet payments from the wrist |
| Contacts synced from the iPhone | Deep integration with OnePlus and Oppo phones |
| Music playback control | |
| Workouts and health data written to Apple Health | |
| The rotating crown, the 5-day battery, dual-band GPS |
The battery life is the whole point of this watch and it is entirely watch-side, so it is unchanged by pairing to an iPhone.
Frequently Asked Questions
References
- OnePlus US product page, Watch 3: materials, sapphire, battery claims, durability, temperature range, OHealth Android 9.0 requirement, dual-engine architecture.
- GSMArena OnePlus Watch 3 spec page and review: dimensions, weight, display and brightness, chip, memory, Bluetooth, dual-band GPS, no LTE, Play Store confirmed.
- GSMArena news: ECG missing in the US and Canada.
- Android Central review: US pricing, the rotating crown, ECG regional status.
- TechRadar: OnePlus commits to three years of operating system and security updates, 2025 to 2027.
- GSMArena, July 2025: the 43mm variant.
