Compare 
There are currently three significant MVNOs (Mobile Virtual Network Operators) using O2's network, namely Giffgaff, Sky Mobile, and Tesco Mobile.
By choosing one of O2's MVNOs you can save money and get extra features, while still enjoying the excellent network coverage provided by O2's mobile network.
Below, you’ll find an overview of each of these MVNO options.
| Network | What they are all about | View deals |
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Low prices and flexible plans | View deals |
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Data rollover and extra benefits for Sky TV customers | View deals |
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Great value plans and even cheaper Clubcard prices | View deals |
1. Giffgaff
Low prices and unlimited data available
Giffgaff is one of the more famous MVNOs and it stands out in a number of ways, perhaps most notably through offering plans with unlimited data and at competitively low prices.
Many of its SIM-only plans are also just 30 days long, giving you plenty of flexibility, though you can alternatively choose an 18-month plan, and these give you more data for your money, along with the promise of no mid-contract price rises.
5G comes as standard on all plans, and the network also offers Pay Monthly plans with a phone.
You can also tether, Pay As You Go, use Wi-Fi Calling, VoLTE (Voice Over LTE), and roam at no extra cost in much of Europe (up to a 5GB fair usage limit).
2. Sky Mobile
Data rollover and great extras for existing Sky customers
Sky Mobile is an O2 MVNO with some near-unique selling points, the first of which being data rollover. It lets you roll over any unused data to the next month and you can save it for up to a year, so you won’t have to pay for data that you’re not using. And if you’re never likely to use the data then you can cash it in for a range of rewards which change frequently.
However, you can also change your allowances every month, so if your plan has too much or too little data, you’ll have plenty of opportunities to adjust it (though you are tied into a 12-month contract on SIM Only).
Sky Mobile is also a very tempting choice if you’re a Sky TV customer, as it lets you use an unlimited amount of data for streaming on Sky apps. Plus, it offers tethering, and both 4G Calling and Wi-Fi Calling, the latter two of which are not offered by all MVNOs. It also offers 5G.
The main downside to Sky Mobile is simply that there’s now a £2 daily fee required to roam in Europe.
Sky Mobile sells both Pay Monthly and SIM Only plans, but no Pay As You Go.
3. Tesco Mobile
A good range of value plans plus 5G support
Tesco Mobile is another typically good value network, and it’s also quite flexible, as when getting a phone on contract you can choose between a 12, 18, 24, 30 or 36-month contract duration, while most networks force you to take a 24-month contract.
SIM Only also gives you some flexibility, with the choice of a 12 or 24-month plan.
Tesco Mobile also offers 5G and plans with unlimited data, plus a range of Pay As You Go options. Plus, the network lets you tether, has cheaper Clubcard prices for some plans, and offers inclusive roaming, Wi-Fi Calling, and 4G Calling.
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