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At the end of the checkout process, you can book an O2 Guru to help you set up your phone.

You'll need to confirm your click and collect selection at check-out.

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Existing Customers
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.

two women taking a selfie

Next generation triple camera

two women taking a selfie

Dynamic 6.2 inch AMOLED display

man taking selfie in open space

Ultra-powerful Galaxy processor

man on surf board on the beach taking a photo

5G ready device

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Tech specs

Reviews

Overall rating

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Reviews

Why O2

Why O2?

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A network you can trust

We're here for you whenever you need us.

So you can stay connected to the people that matter.

Find out more

Bubl and O2
Get Priority

It’s good to be back.

From unique prize draws to unforgettable moments, Priority gives you invite-only access to gigs, perks and experiences.

Find out more

My O2 on phones
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 5G? Collapsed link

The Samsung S21 5G has 6.2-inch screen, Dynamic AMOLED display enforced with Gorilla Glass, giving you the world’s brightest smartphone display.

The powerful Exynos 2100 processor gives you 28% faster performance than previous models; and supports never-before-seen download and upload speeds with the immense connective powers of wifi 6E.

Enjoy a Triple-Lens camera; 12MP Ultra-Wide lens, 12MP Wide lens and a 64MP telephoto lens. And if that’s not enough, the front camera snaps incredible selfies every time with a 10MP Wide lens.

Discover 100x space zoom with improved stability, giving you an enhanced portrait made that delivers professional-level portraits. The camera also has a sharper night mode with laser auto-focus, ultra-smooth video and dual recording – perfect for switching between narrating your videos and capturing the moment.

You can even use your phone to replace your car keys, if your car has Bluetooth functionality.


What’s the screen size of the Samsung Galaxy S21 5G? Collapsed link

The Samsung Galaxy S21 5G has a 6.2-inch screen and an Infinity-O Dynamic AMOLED display, which can play 8K video.


What’s the camera quality of the Samsung Galaxy S21 5G? Collapsed link

Take professional-looking photos with its Triple Camera setup. On the back, it has a triple lens rear camera (12MP Ultra Wide, 12MP Wide and 64MP Telephoto) that offers a crystal-clear picture. There’s also a 10MP front phone camera to give you flawless selfies.

See the full specifications for the Galaxy S21 now.


How long is the Samsung Galaxy S21 5G battery life? Collapsed link

The 4000 mAh battery means your phone will last well over a day in standby mode.


What’s the IP rating of the Samsung Galaxy S21 5G? Collapsed link

This Samsung models' IP68 rating means your phone, in perfect conditions, can withstand water up to a depth of 1.5m for thirty minutes.


What output does the Samsung Galaxy S21 5G charger use? Collapsed link

The S21 uses a 25W Super Fast Charging USB-C charger. But you’ll also be able to wirelessly charge your phone courtesy of Wireless Power share technology.


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

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


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

The Galaxy S21 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.

*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.