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Compare O2 SIM-only deals and contracts

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Galaxy S22 Ultra 5G
Galaxy Z Flip5 5G
iPhone SE (2022)
Pixel 8 5G Dual SIM
Galaxy Z Fold5 5G
Galaxy A55 Dual SIM
Galaxy Z Fold4 5G
Galaxy Z Flip4 5G
Pixel 8a
Pixel 7 5G Dual SIM
Galaxy A25 Dual SIM 5G
Galaxy A54 5G
Pixel 7a 5G
Pixel Fold 5G
Galaxy A15
Razr 40 5G Dual SIM
Galaxy A35 Dual SIM
iPad 10.2" (2021)
Galaxy A14
Galaxy A14 5G
iPad Pro 12.9" (2022) 5G
Redmi Note 12 Pro 5G Dual SIM
Galaxy Tab S9 FE Plus 5G
Pixel 7 Pro 5G Dual SIM
Galaxy Tab S9 5G
Galaxy Tab S9 Ultra 5G
Galaxy A15 5G
iPad Pro 11" (2022) 5G
Xperia 5 V Dual SIM
Moto G 34
Xperia 1 V 5G
Galaxy A05s
iPad Mini (2021)
Galaxy Tab A9 Plus
2660 Flip
iPhone 13 Pro 5G
Galaxy A23 5G
6880
G 22
Xperia 1 VI Dual SIM
X R21 5G Dual SIM
Moto G 14
iPhone 12 Pro Max 5G
Galaxy Tab S9 FE 5G
Galaxy S21 Ultra 5G
Galaxy S21 5G
Moto G 04 Dual SIM
8100
Galaxy Tab S9 Plus 5G
Xperia 10 VI Dual SIM
Galaxy Tab A9 4G
G 42 5G Dual SIM
Galaxy S10
Galaxy A04s Dual SIM
Redmi A2 Dual SIM
3210 (2024) Dual SIM
A 17 Dual SIM
Galaxy A13 5G
Redmi A3 Dual SIM
A 78 Dual SIM
Xperia 10 V
Xperia 10 IV 5G
Redmi 13C Dual SIM
Redmi 12 5G Dual SIM
C 12
iPhone SE
Galaxy Chromebook 2 360
iPhone 8 Plus
Dongle 4G
Pocket hotspot 4G
G 60
iPhone XS
Galaxy Book 2 Go 5G
iPad Air 5 10.9" (2022)
Galaxy Book 3 Pro 360 5G
Galaxy Tab S6 Lite
Watch Ultra 49mm (GPS  Plus Cellular)
iPhone SE (2020)
Galaxy Watch6 Classic 43mm
Galaxy Watch6 Classic 47mm
Galaxy Watch 5 Pro 4G 45mm
Galaxy Watch 4 4G 40mm
Galaxy Tab S7 4G
iPad Air 4 10.9" (2020)
Galaxy Watch6 44mm
Galaxy Tab A7 Lite
Galaxy Tab A8 2021 LTE
Galaxy Watch6 40mm
Galaxy S20 5G
Galaxy Book 2 Pro 5G
Galaxy Book LTE
Galaxy Tab S8 Ultra 5G
Galaxy Book Flex2 5G
Galaxy Watch 5 4G 44mm
Smart Tab M10 Plus (3rd Gen)
Tab M8 4th Gen (2024)
Tab M8 4th Gen
P11 Gen 2
Smart Tab M11

About O2

O2 is one of the largest mobile networks in the UK, originally founded as Cellnet in 1985 and delivering mobile services back when phones were the size of bricks.

A lot has changed since O2 first started up - devices are sleeker, we use our phones more to stream videos than to call our friends, and O2 now runs 3G and 4G networks. It’s currently the UK’s second largest mobile network provider, behind EE, with a 26% market share.

At a glance

The good: The bad:
Widespread and reliable UK coverage Mobile deals are at the more expensive end of the scale
Wide variety of mobile deals to choose from Expensive 30-day SIM only deals
Free access to over 7,000 WiFi hotspots across the UK 4G download speeds lag behind those offered by rival networks
All deals come with unlimited texts
Highly-rated customer service
O2 Priority has a wide range of perks including first access to events tickets
Choose a deal that suits you with O2 Custom Plans
Bills are clear and transparent thanks to O2 Refresh
Get discounts for each family member added to your plan
Wide range of bolt-ons allow you to top up your data, calls, or texts
Get paid for old handsets with O2 Recycle

Device Choice and Contract Flexibility – O2 Refresh

O2 offers a menu of mobile devices from nearly all manufacturers, but Apple and Samsung predominate - O2 seems to know what customers want. You can purchase these handsets on 24-month contracts, paying them off in instalments. You can also pay for your device up front and plug in an O2 SIM card. 12 to 24-month pay monthly mobile contracts are available alongside pay-as-you-go SIMs.

Need a handset but want to avoid the commitment of a 24-month contract? If you buy certain high-end phones on tariffs with 20GB or more of data, you qualify for O2 Refresh, which divides your monthly bill into the device and airtime (talk minutes, texts, and mobile data). After 12 months, you’re then eligible to trade in your current handset, without having to fully pay it off.

Perks and Extras – O2 Priority

Mobile customers can also get access to O2 Priority, which allows them to snag tickets at O2 venues 48 hours before they go on sale - essential if you’re trying to get good seats for a hot concert. You can also jump the queues at those events and head to the O2 lounge and take three friends on other networks with you (so they can hastily switch their phone contracts to O2 too). The O2 Priority app also offers a host of regular offers that customers can use, like £5 mains at Pizza Express available daily.

O2 4G Speed and Network Coverage

O2 offers data allowances of up to 60GB per month, but you may find all the video you can stream in that allowance moves a little slower than it does on other major UK networks. O2’s 4G network is the slowest in Britain. With average download speeds of 15.8 Megabits per second (Mbps), it’s half as slow as EE’s 4G. But O2’s 4G network is the second most reliable, after EE and just ahead of Vodafone. Customers are able to connect to it 84% of the time and avoid using slower 3G.

Despite the slower speeds, 88% of O2 customers report being satisfied with its reception and signal strength, equal to the number satisfied with EE’s and above the industry average of 87%. Overall, customers report 92% satisfaction with O2’s service, leaving it tied for fourth in Ofcom’s latest report on the customer service of the seven largest mobile providers. Ofcom also found that just 3 out of 100,000 pay-monthly customers complained about O2 in the third quarter of 2018, the last period for which data is available. That put O2 in the better half of mobile phone providers.

O2 isn’t the cheapest provider - in fact, you might find better deals with one of the mobile virtual networks (MVNOs) that use its network - but it is a respectable choice, especially if you attend a lot of concerts and events at O2 venues.

What phones can I get with O2?

As one of the Big Four network providers, O2 has one of the widest range of smartphones on offer. This includes the most popular models from Apple’s iPhone range as well as a whole host of Samsung Galaxy handsets. You can also choose from a number of high-end smartphones from smaller manufacturers, including Google, Sony, Nokia, and OnePlus.

Best O2 SIM only deals

O2 offers a number of SIM only deals, available as either rolling, monthly plans, 12 or 24-month contracts, and even on a PAYG basis. Data allowances range all the way from 1GB per month up to unlimited. 

PAYG O2 SIM only deals

O2

Big Bundle 14GB

PAYG

Unlimited

Minutes & Texts

14GB

Data

£10

No upfront fees

O2

Big Bundle 40GB

PAYG

Unlimited

Minutes & Texts

40GB

Data

£15

No upfront fees

O2

Big Bundle 60GB

PAYG

Unlimited

Minutes & Texts

60GB

Data

£20

No upfront fees

O2

Big Bundle 200GB

PAYG

Unlimited

Minutes & Texts

200GB

Data

£30

No upfront fees

1 month O2 SIM only deals

O2

1GB

1 month contract

1000 & Unlimited

Minutes & Texts

1GB

Data

£20 / month

No upfront fees

O2

5GB

1 month contract

Unlimited

Minutes & Texts

5GB

Data

£23 / month

No upfront fees

O2

20GB

1 month contract

Unlimited

Minutes & Texts

20GB

Data

£26 / month

No upfront fees

O2

50GB

1 month contract

Unlimited

Minutes & Texts

50GB

Data

£30 / month

No upfront fees

O2

Unlimited Data

1 month contract

Unlimited

Minutes & Texts

Unlimited

Data

£36 / month

No upfront fees

12 month O2 SIM only deals

O2

1GB

12 month contract

Unlimited

Minutes & Texts

1GB

Data

£13 / month

No upfront fees

(Monthly price will increase each April by the Retail Price Index rate of inflation published in January of that year + an additional 3.9%)

O2

25GB

12 month contract

Unlimited

Minutes & Texts

25GB

Data

£20 / month

No upfront fees

(Monthly price will increase each April by the Retail Price Index rate of inflation published in January of that year + an additional 3.9%)

O2

150GB

12 month contract

Unlimited

Minutes & Texts

150GB

Data

£24.99 / month

No upfront fees

(Monthly price will increase each April by the Retail Price Index rate of inflation published in January of that year + an additional 3.9%)

O2

Unlimited Data

12 month contract

Unlimited

Minutes & Texts

Unlimited

Data

£33 / month

No upfront fees

(Monthly price will increase each April by the Retail Price Index rate of inflation published in January of that year + an additional 3.9%)

24 month O2 SIM only deals

O2

6GB

24 month contract

Unlimited

Minutes & Texts

6GB

Data

£16 / month

No upfront fees

(Monthly price will increase each April by the Retail Price Index rate of inflation published in January of that year + an additional 3.9%)

O2

25GB

24 month contract

Unlimited

Minutes & Texts

25GB

Data

£18 / month

No upfront fees

(Monthly price will increase each April by the Retail Price Index rate of inflation published in January of that year + an additional 3.9%)

O2

150GB

24 month contract

Unlimited

Minutes & Texts

150GB

Data

£22.99 / month

No upfront fees

(Monthly price will increase each April by the Retail Price Index rate of inflation published in January of that year + an additional 3.9%)

O2

Unlimited Data

24 month contract

Unlimited

Minutes & Texts

Unlimited

Data

£30 / month

No upfront fees

(Monthly price will increase each April by the Retail Price Index rate of inflation published in January of that year + an additional 3.9%)