O2 logo
Compare deals
Sort by
Filter resultsDone
Phones with SIMSIM free phonesSIM onlyData SIMs
Data speed
Monthly cost
Contract length
Gifts & extras
CashbackGift VoucherFree Gift
Rolling Plan 10GB10GBdataUnltdminutesUnltdtextsNo contractZeroupfront cost£10.00per monthGet DealO2
Big Bundle 8GB8GBdataUnltdminutesUnltdtextsNo contractZeroupfront cost£10.00per monthGet DealO2
Rolling Plan 30GB30GBdataUnltdminutesUnltdtextsNo contractZeroupfront cost£15.00per monthGet DealO2
Big Bundle 25GB25GBdataUnltdminutesUnltdtextsNo contractZeroupfront cost£15.00per monthGet DealO2
SIM Only3GBdataUnltdminutesUnltdtexts24month contractZeroupfront cost£15.00per month(prices may change during contract)Get DealO2
SIM Only Plus 30GBInclusive Roaming in 75 Destinations30GBdataUnltdminutesUnltdtexts24month contractZeroupfront cost£16.99per month(prices may change during contract)Get DealO2
SIM Only6GBdataUnltdminutesUnltdtexts24month contractZeroupfront cost£17.00per month(prices may change during contract)Get DealO2
SIM Only Plus 12GBInclusive Roaming in 75 Destinations12GBdataUnltdminutesUnltdtexts24month contractZeroupfront cost£17.99per month(prices may change during contract)Get DealO2
SIM Only1GBdataUnltdminutesUnltdtexts12month contractZeroupfront cost£18.00per month(prices may change during contract)Get DealO2
SIM Only Plus 60GBInclusive Roaming in 75 Destinations60GBdataUnltdminutesUnltdtexts24month contractZeroupfront cost£18.99per month(prices may change during contract)Get DealO2
SIM Only20GBdataUnltdminutesUnltdtexts24month contractZeroupfront cost£19.00per month(prices may change during contract)Get DealO2
Rolling Plan 50GB50GBdataUnltdminutesUnltdtextsNo contractZeroupfront cost£20.00per monthGet DealO2
Big Bundle 40GB40GBdataUnltdminutesUnltdtextsNo contractZeroupfront cost£20.00per monthGet DealO2
SIM Only6GBdataUnltdminutesUnltdtexts12month contractZeroupfront cost£20.00per month(prices may change during contract)Get DealO2
SIM Only1GBdata1000minutesUnltdtexts1month contractZeroupfront cost£20.00per monthGet DealO2
Show me more deals
{"comparison-market":"enhanced-telco","config-name":"generic","numberOfDealsToDisplay":15,"sort":"most_popular","always-set-filters":{"deal-type-section":["New Consumer"],"reseller-section":["exclude-all"],"network-section":["O2"]},"exclude-filters":[],"filter-section-order":[],"excluded-filter-sections":[],"page-attributes":[],"filter-sections":[{"id":"product-type-section","filter_group":[{"id":"product-type-group-1","mutex":true,"filter":[{"id":"phone-with-sim","label":"Phones with SIM","sets_attribute":["handset","sim"],"selected":false},{"id":"phone-sim-free","label":"SIM free phones","sets_attribute":["handset"],"selected":false},{"id":"sim-only","label":"SIM only","sets_attribute":["sim"],"selected":true},{"id":"data-sim","label":"Data SIMs","sets_attribute":["data-sim"],"selected":false}],"default_id":"phone-with-sim","disallow_manual_deselect":true}],"section_heading":""},{"id":"data-standard-section","filter_group":[{"id":"product-type-group-1","mutex":true,"filter":[{"id":"any","label":"Any"},{"id":"5g","label":"5G"}],"default_id":"any","disallow_manual_deselect":true}],"section_heading":"Data speed"},{"id":"monthly-cost-section","filter_group":[{"id":"monthly-cost-group-1","mutex":true,"filter":[{"id":"10","label":"u00a30-u00a310"},{"id":"30","label":"u00a310-u00a330"},{"id":"50","label":"u00a330-u00a350"},{"id":"80","label":"u00a350-u00a380"},{"id":"over80","label":"u00a380+"}]}],"is_attribute_of":["sim","data-sim"],"section_heading":"Monthly cost"},{"id":"talk-time-section","filter_group":[{"id":"talk-time-group-1","mutex":true,"filter":[{"id":"500","label":"500+"},{"id":"1000","label":"1000+"},{"id":"5000","label":"5000+"},{"id":"UNLIMITED","label":"Unlimited"}]}],"is_attribute_of":["sim"],"section_heading":"Minutes"},{"id":"data-section","filter_group":[{"id":"data-group-1","mutex":true,"filter":[{"id":"1000","label":"1GB+"},{"id":"2000","label":"2GB+"},{"id":"5000","label":"5GB+"},{"id":"10000","label":"10GB+"},{"id":"50000","label":"50GB+"},{"id":"UNLIMITED","label":"Unlimited"}]}],"is_attribute_of":["sim","data-sim"],"section_heading":"Data"},{"id":"contract-length-section","filter_group":[{"id":"contract-length-group-1","filter":[{"id":"payg","label":"PAYG"},{"id":"1","label":"1"},{"id":"12","label":"1-12"},{"id":"over12","label":"12+"}]}],"is_attribute_of":["sim","data-sim"],"section_heading":"Contract length"},{"id":"gift-section","filter_group":[{"id":"gift-group-1","filter":[{"id":"Cashback","label":"Cashback"},{"id":"Gift Voucher","label":"Gift Voucher"},{"id":"Free Gift","label":"Free Gift"}]}],"section_heading":"Gifts & extras"}],"hide-filter-pane":false}
Cable.co.uk may earn a commission when you purchase via links on our site. The price you pay will always be equal to or often cheaper than the price you would pay by going direct to the provider. Please refer to individual provider's terms and conditions before signing up. All prices are inclusive of VAT except business prices.

Why choose O2 SIM only?

Choice of contract length

You can choose your level of commitment with O2, as its SIM-only mobile phone deals come with 30-day, 12-month or 24-month contracts. Opting for a shorter contract is always more expensive, but signing up for a 30-day contract gives you the flexibility of being able to leave whenever you want.

Unlimited data options

O2 offers a wide choice of data allowances to suit every budget and requirement with its pay monthly SIM-only deals, from as little as 1GB to Unlimited data. PAYG customers are more limited, with allowances ranging from 7GB to 100GB.

All O2 SIM-only deals also come with unlimited calls and texts, so you need have no worries about going over your limit. Just remember that picture messages are charged as extra.

5G-ready SIM deals

All O2 SIM-only deals are 5G-ready. If your phone is 5G-ready, and you live in an area with a good 5G signal, you’ll automatically be upgraded to the faster service as all O2 SIMs are 5G enabled. Customers without a 5G enabled phone will still be able to access O2’s 4G network. O2 is still rolling out its 5G network across the UK, so it is not yet available everywhere. If this is the case in your area, you will automatically be connected to the 4G signal.

Good coverage and speed

O2 provides 99% coverage across the UK with its 4G signal, and its 5G service is also growing rapidly. To check what the signal is like in your area, including whether you can get 5G, visit O2’s coverage checker. O2 offers an average download speed of 18.2Mbps on its 4G network, and up to 100Mbps or above on its 5G network.

Freebies and discounts with O2 Priority

O2’s loyalty scheme, O2 Priority, gives all customers the option to enjoy a range of benefits, from free Odeon cinema tickets and drinks, to discounted shopping, travel and pre-sale tickets for gigs and other events.

Rewards and discounts with O2 Rewards for PAYG customers

Exclusively for PAYG customers, O2 Rewards gives back 5-10% of all top-ups you make in a three-month period, which can then be claimed back as extra airtime credit or put towards tickets for gigs, shopping vouchers or even a new handset.

Data rollover on O2 Big Bundle PAYG deals

O2 allows all PAYG customers the option to roll over unused data to the next month, as long as you renew your Big Bundle on the date it expires.

SIM-only deals for tablets

If you are looking for a SIM for your tablet, then O2 caters for this too, with a choice of five data allowances ranging from 2GB to 100GB per month. Both 30-day and 12-month options are available.

Free O2 Wifi

To help customers keep hold of their data, O2 offers free wifi in around 16,000 locations around the country. Customers that bought their phone directly from O2, or iPhone customers will be able to connect automatically. All other customers can register to connect. O2 Wifi is available at hundreds of locations, including all branches of Pizza Hut, Costa Coffee, House of Fraser, Matalan and Subway, as well as Shell garages, Pure Gym, and a wide range of bars and pubs.

Flexibility with a choice of contract and non-contract deals

When you sign up for a new phone contract, it is likely you will be tied in for at least a couple of years. SIM-only deals enable you to choose both the length of time you want to commit, and whether you want a short contract or even just pay as you go.

Frequently asked questions

Which length contract should I choose?

O2 offers three contracts with its SIM-only deals: a 30-day contract for those wanting the flexibility to be able to leave at the drop of a hat, and a 12-month contract or 24-month contract for those that are happy to commit. The longer contracts usually cost less per month for the same amount of data, but come with the risk of not being able to leave if your circumstances change.

How do I switch to O2?

Once you’ve chosen a new SIM, you’ll need to speak to your current provider and tell it that you’re leaving. It’s best if this is done outside of your contract period, as you’ll likely incur a cancellation fee if you don’t.

Can I keep my phone number when I switch to O2?

If you want to keep your current mobile number, and you are moving from a different provider to O2, you will need to request a port authorisation code (PAC) from your existing provider. You should give this number to O2 when you order your new SIM. If you are already with O2, you will be able to keep your existing phone number.

How do I unlock my phone?

Your existing network will unlock your phone for you. You will need the IMEI number, which is a unique identifier for your phone. Simply dial *#06# into your phone and the IMEI number will flash up. You can then give this number to your current provider. It can take anything from a couple of days to almost a month to get your phone unlocked and there may or may not be a small fee to pay. You can check these details with your current provider.

Can I use my O2 service abroad?

Yes. O2 offers free inclusive roaming throughout Europe. Customers wanting to use their phone further afield can sign up for O2 Travel for a small extra fee.

Can I tether with O2?

Yes, O2 permits tethering on all its SIM-only plans, including PAYG, up to the amount of data on your plan. If you have an unlimited data SIM, you are permitted to tether as much as you wish, although if you do so excessively (O2 states more than 650GB twice in six months or regularly tethering more than 12 devices) it will impose restrictions in accordance with its fair use policy.

See also