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Existing Customers

Apple Watch is available to O2 Pay Monthly customers with an iPhone 6s or newer (Apple Watch Series 4 also compatible with iPhone 6).

New Customers
New Customers

Before you can get your watch, you'll need to buy an iPhone 6s or newer (Apple Watch Series 4 also compatible with iPhone 6), with an O2 Pay Monthly tariff. Once you've done that, come back and you can add your watch.

Before you can get your watch, you'll need to buy an iPhone 6s or newer (Apple Watch Series 4 also compatible with iPhone 6), with an O2 Pay Monthly tariff. Once you've done that, come back and you can add your watch.

s21 ultra 5g triple lense camera

Triple telephoto lenses

Samsung Galaxy S21 Ultra 5G

Dynamic 6.8 inch AMOLED display

s21 ultra 5g in phantom black - back of the device

Limitless power at your fingertips

5g ready device

5G ready device

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Tech specs

Reviews

Overall rating

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Reviews

Why O2

Why O2?

Robot on a mountain
A network you can trust

We're here for you whenever you need us.

So you can stay connected to the people that matter.

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Priority
Priority

On O2, you’re the headline act.

Priority gives you invite-only access to tickets, perks and experiences.

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My O2
My O2

Manage your account 24/7.

View your bills, see your data usage, check your upgrade options and more. Just sign in to My O2 online, or get the app for free.

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FAQs

FAQs

What are the specifications of the Samsung Galaxy S21 Ultra 5G?

The Samsung Galaxy S21 Ultra 5G is expertly crafted with durable Gorilla Glass and boasts the world’s brightest smartphone display.

The next generation brings even faster processing speeds thanks to an Exynos 2100 processor. The Samsung Galaxy S21 Ultra 5G has a 6.8-inch WQHD+ Dynamic AMOLED screen.

For the first time ever, a handset is able to support the immense connective powers of wifi 6E, giving you impressive download and upload speeds.

The Samsung Galaxy 5G is so fast, you’ll be able to download your favourite games in under record speed while using 5G. You can even use your phone to replace your car keys if your car has Bluetooth functionality.

As for the camera, it’s a state of the art. The quad rear set up includes a 12MP Ultra Wide and 108MP Wide lens. And if that’s not enough for you, the front camera is an incredible 40MP Wide lens – perfect for snapping beautiful selfies, every time.

The Samsung Galaxy S21 Ultra features an enhanced portrait mode for professional-grade portraits with studio-esque lighting. The camera also has an improved night mode with laser auto-focus, ultra-smooth video with dynamic slow-mo and dual recording capabilities.


What’s the Samsung Galaxy S21 Ultra 5G screen size?

The Samsung Galaxy S21 Ultra 5G has a 6.8-inch WQHD+ Dynamic AMOLED adaptive display.


What’s the Samsung Galaxy S21 Ultra 5G camera quality?

The Samsung Galaxy S21 Ultra 5G has a Quadruple-lens rear camera set up (12MP + 108MP + 10MP + 10MP) with an additional Laser AF Time-of-Flight sensor that provides the sharpest picture in a Samsung phone to date. And for selfies, there’s a powerful 10MP front-facing camera.

See the full specifications for the Samsung Galaxy S21 Ultra 5G now.


What is the Samsung Galaxy S21 Ultra 5G battery life?

The Samsung Galaxy S21 Ultra 5G has a 5000mAh battery that is by far the most powerful in a Samsung phone to date.


What is the Samsung Galaxy S21 Ultra 5G IP rating?

The Samsung Galaxy S21 Ultra 5G has an IP68 rating, meaning this device will survive in 1.5m of water for up to 30 minutes – just don’t take it scuba diving with you.


What charger does the Samsung Galaxy S21 Ultra 5G use?

The Samsung Galaxy S21 Ultra 5G comes with a USB-C 25W Super Fast charger. If that wasn’t enough, it also has 15W Fast Wireless charging.


What’s the price of the Samsung Galaxy S21 Ultra 5G on Pay Monthly contract?

Choose the plan that works for you with our Samsung Galaxy S21 Ultra 5G contract calculator.


How much is the Samsung Galaxy S21 Ultra 5G on Pay As You Go?

The Samsung Galaxy S21 Ultra 5G isn’t currently available on O2 Pay As You Go. Keep checking back for updates, or take a look at our flexible Pay Monthly plans.


The legal bit

Custom plans

RPI: Each year your Airtime Plan will be increased by the Retail Price Index (RPI) rate of inflation announced in February plus 3.9%. If RPI is negative, we’ll only apply the 3.9%. You’ll see this increase on your April 2022 bill onwards. Find out more at o2.co.uk/prices.

Direct purchases only. Pay the cash price for your device or spread the cost over 3 to 36 months (excludes dongles). The cost of your Device will be the same however long you choose. A minimum upfront cost may apply. You need a monthly rolling Airtime Plan for the length of the Device Plan. Pay off your Device Plan at any time without charge. You can then keep on your Airtime Plan, upgrade or leave. If your Airtime Plan ends for any reason (including for switching to another operator) you will need to pay your Device Plan in full.

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 Telefónica UK Ltd, SL1 4DX. Terms apply, see o2.co.uk/terms.

Get Unlimited Data

RPI: Each year your Airtime Plan will be increased by the Retail Price Index (RPI) rate of inflation announced in February plus 3.9%. If RPI is negative, we’ll only apply the 3.9%. You’ll see this increase on your April 2022 bill onwards. See o2.co.uk/prices.

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. 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, chargeable at £3.50 per GB afterwards. For full terms see www.o2.co.uk/terms.

Claim a £150 Google Play Gift Code

Promoter: Samsung Electronics (UK) Limited. UK, Isle of Man or Channel Islands residents (18+) only or registered companies in the same.  Purchase an eligible promotion product from a participating retailer between 24/03/2021 – 30/04/2021 and claim £150 Google Play Gift Code by redemption. No cash alternative. Participants must visit www.samsungpromotions.claims/googleplay, upload proof of purchase and provide all other required information (Claim). All Participants must claim between 0-30 days of purchase.  Maximum 1 Claim per Promotion Product purchased (maximum 4 Claims per household) and a maximum of 50 Claims per company participant. See www.samsungpromotions.claims/googleplay for full Promotion terms. Subject to availability, while stocks last. No cash or alternatives. Damaged or lost redemption vouchers will not be replaced. Offer may be withdrawn or amended at any time. Change of mind policy applies to Qualifying Purchase and Gift as a bundle. If you return the Qualifying Purchase without the Gift you will be charged the standard retail price for the Gift. Internet access is required.

*Each year your Airtime Plan will be increased by the Retail Price Index (RPI) rate of inflation announced in February plus 3.9%. If RPI is negative, we’ll only apply the 3.9%. You’ll see this increase on your April 2022 bill onwards. See o2.co.uk/prices.