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Midnight
Midnight
Starlight
Capacity:
64GB
Choose your plan
Unlimited
CLASSIC PLAN
-What's this?48 month contract
£1.00
UPFRONT
+
£13.00
MONTHLY
Total monthly cost increasing to:
From Apr 2027 bill
£13.75
From Apr 2028 bill
£14.50
Monthly cost breakdown:
£6.00 Device + £7.00 Airtime
Features
Tech Specs
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40mm
Smartwatch Screen Size
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Up to 18 hours
Battery Life
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5G
Data Connectivity
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26.4g
Weight
Brand:
Apple
Weight (g):
26.4g
Battery (eComm):
Up to 18 hours of normal use
Processor:
S10 SiP
Dimensions (mm):
40 x 34 x 10.7mm
Screen Size (inches):
40mm
What's In The Box:
Apple Watch SE 3, Strap, Apple Watch Magnetic Charger to USB-C Cable (1m)
Accessibility:
Yes
Internal Storage (GB):
64GB
Operating System (eComm):
watchOS
Water Resistance (IP Rating):
Yes - 50m
Removable battery:
No
Expandable Storage:
No
Facial Recognition:
No
Fingerprint Recognition:
No
GPS:
Yes
NFC (eComm):
No
Wi-Fi:
No
Dual Sim:
No
FM Radio:
No
Bluetooth:
Yes
Fast Charging:
Yes
Charger in box:
Yes
Wireless Charging (eComm):
Yes
Wi-Fi and 4G Calling:
No
Type Of Charger Connector:
USB-C magnetic fast charge
Music Player:
No
Why O2 ?
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Here to help you
Get help with your device. Find the answers to your questions on our help and support pages. Get help with your device, O2 account and more.
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Get Priority
From unique prize draws to unforgettable moments. Priority gives you invite-only access to gigs, perks and experiences.
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My O2
Check your bill, view your balance, add Bolt Ons and more. Anytime, anywhere.
FAQs
Apple Watch SE 3 40mm was announced on 9th September, 2025 and the official Watch SE 3 release date was on 19th September, 2025. It's available to buy now at O2.
Introducing Apple Watch SE 3.
Designed to keep you connected, active and informed. Built with a bright, Always-On Retina display that’s easy to read at a glance. Perfect for when you're on the move.
Packed with Apple’s latest S10 chip, it’s fast, responsive, and efficient - handling apps, notifications, and fitness tracking seamlessly.
Looking to upgrade your fitness? Watch SE 3 is loaded with features to help you achieve your personal best, with heart rate monitoring, sleep score and sleep apnoea, workout detection, and fall detection.
Keep it moving with up to 32 hours of battery life in low power mode or up to 18 hours of power on a full single charge with normal use. Watch SE 3 charges 2x faster than before and supports fast-charging, meaning you’ll be ready to set off in no time.
Yes, you can. Watch SE 3 is built to track your sleep and notify you for possible sleep apnoea. View your sleep score to track how well you've rested. It’s sleep insights made simple, right on your wrist.
Watch SE 3 runs WatchOS 26 with new AI-driven features, smarter notifications, and smooth integration with iPhone and other Apple devices.
Watch SE 3 is designed with versatility and style in mind. Available in 2 recycled aluminium finishes, you can choose from: Midnight or Starlight.
Supporting both GPS and cellular options (eSIM-ready), along with the Bluetooth 5.3, Wi‑Fi 4 and 5G connectivity. Watch SE 3 keeps you connected for calls and messages on the go.
Speed through the day with ease using Apple Watch SE 3's long-lasting battery life. Delivering up to 18 hours of power with normal use or up to 32 hours of battery life in low power mode, it'll keep up with you and your busy lifestyle no matter what.
Not quite. It is water resistant up to 50 metres, so you go for a swim or run in the rain - Watch SE 3 has got you covered.
Advance your health tracking to the next level with Watch SE 3. With blood oxygen monitoring and sleep pattern tracking, you'll be able to stay close to your progress and make sure you're always on track.
Featuring alerts for crash detection, cycle tracking, high or low heart rate and fall detection to make sure you stay safe while pushing towards your goals.
Take your workouts underwater with water resistance up to 50 metres. Track your swims, map routes in open water and measure your performance.
We have a range of plans to help you spread the cost. Explore all of our best Watch SE 3 Pay Monthly deals, take a look at our pre-built tariffs, or tailor one to you. Available now at O2.
The legal bit
Custom plans
Direct purchases only. Pay the cash price for your device or spread the cost over 3 to 36 months (excludes dongles). Certain device costs available to be spread over 3 to 48 months. The cost of your Device will be the same however long you choose. There may be an upfront cost. For customers who took out an O2 Refresh custom plan on or after 17 December 2021, your Airtime Plan and Device plans unlink after 24 months. This means that if you are in the first 24 months of your Device Plan you will have to pay off your Device Plan in full if you decide to end your Airtime Plan. After 24 months you can: keep your Airtime and Device Plans without changing anything Cancel your Airtime Plan and keep paying off your Device Plan instalments or, Cancel your Airtime Plan and pay off your Device Plan in full. For customers who took out an O2 Refresh custom plan before the 17 December 2021 the Airtime and Device Plans remain linked for the duration of the Device Plan, this means you will have to pay off your Device Plan in full if you decide to end your Airtime Plan at any point.
UK calls/texts to standard UK landlines and mobiles and when roaming in our Europe Zone. Fair Usage policy applies. Special and out of bundle numbers chargeable. 4G phone required to access 4G. 4G available in selected areas.
Change your airtime tariff after 30 days and then once every billing month during your minimum contract period, choosing from a selected family of tariffs. Some tariff extras are only available on the starting tariff, are not transferable, and may be lost if you change to an ineligible tariff. Devices are subject to availability.
0% APR. Finance subject to status and credit checks, 18+, Direct Debit. Credit provided by Telefonica UK Ltd, 500 Brook Drive, Reading, RG2 6UU, UK. Terms apply, see o2.co.uk/terms.
Get Unlimited Data
Unlimited Data available on O2 Custom Plans on selected handsets and selected SIM Only tariffs. Fair use policy applies, personal and non-commercial usage only. This policy asks that you only use our services or SIM cards for private, personal and legitimate consumer purposes, and not for business purposes. See more at www.o2.co.uk/fair-usage-policy. If you regularly use 650GB of data per month or tether 12 or more devices we may consider this to be non permitted use and have the right to move you to a more suitable plan. EU roaming capped at 25GB per month. For full terms see www.o2.co.uk/terms.
Subject to Annual Price Increase
Monthly price of your Airtime Plan will increase by £2.50 each April, except Data Only and Smartwatch Plans which will increase by 75p. Out of bundle charges increase by 5% every 1 April.