Explore Mobile Phones

O2 SIM only deals

× Filters Reset

Filters

Monthly cost (£)
0
50
Data (GB)
0
Unltd
Minutes
0
Unltd
Texts
0
Unltd
Contract length
Providers
Show all
More filter options
Unltd
texts
Unltd
minutes
12GB
of 5G data
12
month contract
£9.00
per month
  • 3 months free Disney+
  • Special offers with O2 Priority
  • Free delivery
  • 14 day returns policy
100
texts
0
minutes
2GB
of 5G data
12
month contract
£10.00
per month
  • Special offers with O2 Priority
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
1GB
of 5G data
12
month contract
£12.00
per month
  • 6 months free Disney+
  • Special offers with O2 Priority
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
4GB
of 5G data
12
month contract
£14.00
per month
  • 6 months free Disney+
  • Special offers with O2 Priority
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
8GB
of 5G data
12
month contract
£15.00
per month
  • 6 months free Disney+
  • Special offers with O2 Priority
  • Free delivery
  • 14 day returns policy
100
texts
0
minutes
5GB
of 5G data
12
month contract
£15.00
per month
  • Special offers with O2 Priority
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
20GB
of 5G data
12
month contract
£18.00
per month
  • 6 months free Disney+
  • Special offers with O2 Priority
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
5GB
of 5G data
24
month contract
£10.00
per month
  • 6 months free Disney+
  • Special offers with O2 Priority
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
100GB
of 5G data
12
month contract
£20.00
per month
  • 6 months free Disney+
  • Special offers with O2 Priority
  • Free delivery
  • 14 day returns policy
100
texts
0
minutes
20GB
of 5G data
12
month contract
£22.00
per month
  • Special offers with O2 Priority
  • Free delivery
  • 14 day returns policy

O2 SIM only deals

If you’re looking for a SIM-only deal, O2 is a great option. It offers lots of SIM plans to choose from, at a reasonable price, and plenty of benefits. Read our guide to learn about O2 and how to pick a SIM deal.

Compare deals

Our best O2 SIMs this week

  • O2 sim only
    5G
    • 10GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • Special offers with O2 Priority
    • £8.00 per month
    12 month contract From O2
  • O2 sim only
    5G
    • 12GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • 3 months free Disney+
    • £9.00 per month
    12 month contract From O2
  • O2 sim only
    5G
    • 20GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • 6 months free Disney+
    • £18.00 per month
    12 month contract From O2

Why choose an O2 SIM?

  • Good coverage: O2’s coverage is excellent for 2G, 3G and 4G, with widespread coverage inside and out. 5G network is also now on offer in major towns and cities.
  • Speed: Speeds are decent. The average 4G download speed is 18.2Mbps according to an Opensignal study in 2020, while upload speed comes in at 6.2Mbps
  • O2 Rewards offers and discounts: O2's customer rewards scheme is one of the best around, with promotions and discounts at a range of high street stores and restaurants
  • O2 Priority: Priority ticket-booking and perks at O2 venues
  • Roaming: EU roaming means O2 customers can use their texts, calls and data allowance for no extra cost in a range of locations, as long as they are listed in O2’s ‘Europe Zone’. For international roaming, customers can use O2 Travel add-ons
  • Customer service: All calls made to O2’s customer service helpline are free when made from a pay monthly handset
  • Data rollover: O2 pay as you go customers can roll over any unused data at the end of the month
  • Free Wi-FI: O2 offers free Wi-Fi in more than 15,000 locations across the UK. Customers can also make calls over Wi-Fi.

O2 Rewards and O2 Priority: what do you get?

As well as discounts at high-street outlets, O2's reward schemes get you...

O2 Priority presale tickets: If you enjoy live entertainment, you’ll be pleased to hear that O2 customers can buy tickets for events at any O2 venue 48 hours before the tickets go on general sale

Perks at O2 venues and Twickenham: You’ll enjoy perks at O2 venues, such as priority queuing, lounge access, free cloakrooms and food and drink deals

O2 Rewards: Pay as you go customers get up to 10% off top-ups back every three months

Is O2 a good network?

As Britain’s oldest network, O2 is one of the most familiar and popular providers. And for good reason. It offers flexible packages, lots of mid-tier to premium handsets and great perks.

Coverage is very good and between 3G, 4G and now 5G, it reaches 99% of the UK population.

O2’s customer service is decent and it boasts some of the best extras and benefits out there.

Its plans can be a little pricier than other providers, so if you’re on a budget O2 may not be the best option. If value is what you’re after, check out our cheap SIM-only deals.

What to look for in an O2 SIM contract

The most important things to consider when picking any SIM from any network are monthly allowances and price.

When looking for an O2 SIM contract, you need to ensure you’re getting the deal that most closely matches your requirements.

O2 has some of the best SIM-only deals suitable for every budget and requirement, including a handful of data-only SIMs for tablets or mobile broadband devices.

You can check what O2’s network coverage is like in your area by using their onsite coverage map.

Make sure you check the detail of the contract, for example contract length, the monthly price, and whether it’s 4G or 5G ready.

Cheap O2 SIMs

  • O2 sim only
    5G
    • 10GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • Special offers with O2 Priority
    • £8.00 per month
    12 month contract From O2
  • O2 sim only
    5G
    • 10GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • Special offers with O2 Priority
    • £8.00 per month
    12 month contract From O2
  • O2 sim only
    5G
    • 10GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • Special offers with O2 Priority
    • £8.00 per month
    12 month contract From O2

Does O2 offer SIM plans for bad credit?

If you’ve got bad credit, it will be more difficult for you to get an O2 SIM contract. However, O2 do offer security deposit options if certain criteria are met.

12-month O2 SIMs

There are many options for 12-month contracts with O2 and these are usually cheaper than shorter contract terms.

Make sure you definitely want to commit to a year’s contract, or you will have to pay a cancellation fee.

O2 SIMs with unlimited data

O2 offers unlimited data with a 12-month or 18-month SIM-only deal.

This means you can stream movies, listen to music and play games without worrying about going over your data limit.

Should I get unlimited calls and texts?

All O2 SIM-only deals come with unlimited calls and texts.

Which networks offer good SIM plan alternatives?

Frequently asked questions

Can I use my O2 SIM abroad?

Yes, O2 Roaming allows you to use your O2 SIM abroad.

EU roaming: O2 customers can use their texts, calls and data allowance for no extra charge in a range of European and some non-EU locations

International roaming: For customers looking to travel outside the Europe Zone, there are O2 Travel add-ons. These let you use as much as data you like while you're away

Can I get 5G enabled O2 SIMs?

Yes, O2 sells SIMs that will get you a 5G service. However, be aware you'll need a 5G-compatible phone too.

Can I keep my mobile number if I switch to an O2 SIM-only deal?

Yes, you can keep your old mobile phone number. If you’re moving from another network, you’ll need to call them and request your PAC (porting authorisation code). You will need to provide this to O2 who will move your number over.

If you are already an O2 customer, you’ll need to fill in a ‘keep my number’ form on their website.

Do I need an unlocked phone to use an O2 SIM?

If your phone is from another provider, it may be locked to that network and therefore an O2 SIM would not work.

It’s easy to check whether your phone is locked by popping a friend or family’s SIM card (from a different provider to yours) into your phone.

If it works, then you’re good to go, otherwise you will need to contact your current operator and ask them to unlock it.

Are O2 SIM only deals cheaper than contract?

It's almost always cheaper in the long run to buy a phone outright and take out a SIM-only deal.

However, because of the way O2's 'Refresh' contracts work, they're actually not that much more expensive than going SIM-only.

They split your bill up to show you how much you're paying for your device and how much you're paying for your SIM - you can see that the only extra cost you pay on the handset is interest.