Apple Watch Series 11 Aluminium 42mm

5G SA

It was announced for pre-order on 9 September, 2025. Apple Watch Series 11 officially launched on 19 September, 2025. Buy now on a Pay Monthly plan at O2.

Show your style in a Black Sport Band or Light Blush Sport Band. The soft, durable material strikes a perfect balance for everyday comfort and fitness goals.

Watch Series 11 battery life is better than ever, up to 24 hours thanks to the improved energy-efficient display and processor. Stay connected for those long flights, adventurous hikes and sleep tracking at night. Go even further using Low Power mode. Power back up in no time, from wireless charging to fast charging up to 8 hours in 15 minutes.

Always the right style, whatever the choice. Series 11 comes in a timeless Jet Black, Space Grey, and Rose Gold aluminium finish.

Apple Watch Series 11 comes in 42mm and 46mm faces. The S/M band fits 130–200mm wrists, while the larger band suits 140–245mm wrists. If your wrist is 170mm or more, the bigger band might be a more comfortable fit. Switching bands is simple with the quick-release button.

Health
Track your fitness activity across metrics such as heart rate, ECG, blood oxygen, and now blood pressure (hypertension) trends over a 30-day period. Advanced sensors on Apple Watch push boundaries for monitoring performance. From checking your heart rate in real time at rest or during workouts to ECG for signs of atrial fibrillation or other irregular heart rhythms. Stay on top of your general health with medication reminders, alerts for loud environments, and guided apps to boost your mental wellbeing.

Safety
Fall detection, emergency SOS, and crash alerts remain at the heart of Apple Watch, giving you peace of mind wherever you go.

Sleep tracking
Quality sleep is essential for living. Now, it's easier than ever to see how well you've rested using the sleep score system. With 5+ million nights of data, it rates sleep quality based on duration, consistency, awakenings, and stages of your sleep. Plus, the accelerometer with machine learning can detect sleep apnoea, which could lead to diabetes and cardiac issues.

Apple Intelligence
Introducing Workout Buddy, an AI-driven health coach to assist you with your exercise and wellness. Or, translate languages in real-time around the world with the speaker or your airpods.

Running - Create custom interval workouts, track heart rate zones, race routes, stride length, ground contact time, vertical oscillation, and benefit from automatic track detection. Customise workout views to focus on what matters most.

Hiking - Stay on track with bearing, incline, elevation, and coordinates. Mark custom waypoints and let cellular connectivity generate automatic waypoints. Backtrack GPS helps you to retrace your steps.

Cycling - Measure average speed, elevation gain, and distance. Connect to Bluetooth accessories, track Functional Threshold Power, power zones, cadence, and see live activity updates on iPhone.

Swimming - Whether in the pool or open water, track splits, auto sets, SWOLF score, automatic stroke detection, kickboard use, average pace, distance, and total lengths.

Surfing - Explore the waves with a built-in depth gauge and water temperature sensors. The Tide app shows high and low tides, plus key performance stats like distance and speed.

Snorkelling - Designed for underwater adventures with visibility tracking up to 6 metres (20 ft).

Not exactly, it provides water resistance. Perfect for workouts in water up to 50 metres, but it’s best upgrading to Apple Watch Ultra for high-velocity activities like jet-skiing or deep-sea diving.

Absolutely. Stay connected to the internet for life on the move. Experience fast-speed 5G cellular on the O2 network, giving you hands-free calls, Siri voice assistance, and much more without needing your iPhone. New modem and antenna architecture delivers improved coverage and better battery efficiency.

Explore all our best Apple Watch Series 11 deals and Pay Monthly contracts right here and pick the plan that suits you. Plus, O2 Perks for travel, shopping and entertainment.