Compare O2 SIM only deals

If you’re looking to switch networks, O2 is a fantastic choice. It delivers 97% 4G coverage across the UK and 5G in a growing number of locations. On top of this, it’s one of the only major networks that still offer EU roaming at no extra charge. It also has a fantastic rewards app with freebies, discounts, and priority tickets for events at O2 venues.

Once you’ve decided on signing up for an O2 SIM, the next thing you need to work out is how much data you need. Most O2 SIM deals come with unlimited calls and texts, so the biggest decision you need to make is how much data you think you’ll need and how much you want to pay per month.

Generally, an average smartphone user gets through roughly 5-10GB a month. This is typically enough to cover general use, like checking emails, sending WhatsApp messages and scrolling through social media.

However, data options can go well over 100GB and even to unlimited tariffs. Prices will often go up the higher the cap goes, though.

Much of what you decide depends on how much time you spend connected to Wi-Fi at home or work. So, if you’re on the move a lot, you might want to consider signing up for a larger data plan.

If you’d like to find out how much data you use in a month, check your network’s app. There, you’ll find a monthly breakdown of your usage.

O2 offers a wide range of SIM only deals, from cheap SIM plans to big, unlimited data contracts. At the time of writing, O2 SIM only plans start from just £6 a month for 4GB of data, up to a 250GB data SIM for £18 a month.

At the time of writing, O2 currently offers SIMs to suit all needs, including:

O2 delivers 5G SIM only deals as standard now, with even its cheapest plans able to connect to 5G networks. However, you should bear in mind that your mobile phone also needs to be 5G-enabled for you to be able to take advantage of those faster speeds.

O2’s SIM only contract deals last 12 months, so you’ll be tied in for a year. Unless, of course, you opt for an O2 pay-as-you-go SIM, which means that you only pay for the usage you need. If you’re not planning to use your phone regularly, this might be a good option.

But if you plan on using it for regular calls, texts and internet use, you’d probably be better off signing up for a cheap O2 SIM deal.

O2 SIM only deals usually last for 12 months. Alternatively, you could opt for an O2 pay-as-you-go SIM, although these can be more expensive if you use your phone regularly.

O2 makes it really easy to activate its SIM cards. If you’ve received a physical SIM card, it should be ready to go. All you need to do is pop it into your handset, and it should start working straight away. If it doesn’t, you may need to restart your device.

If you’ve got an eSIM, you’ll need to download the eSIM profile onto your device. To do this, scan the QR code included in your eSIM pack.

Yes, keeping your number is easy if you’re switching to an O2 SIM only deal. Text PAC to 65075 to receive your PAC code. Then, contact O2 and give them the code so they can transfer your new number for you.

You can call O2 on 034 4809 0222.

Once your contract is nearing its end, you’ll receive an email or text message from O2. Once you’ve received this, you can access your O2 app and find upgrade options.

However, these aren’t generally the most competitive deals, and you should be able to find options that are much better value for money if you shop around. If you want to check out some options, compare our best SIM only deals on Uswitch.

Is O2 not right for you? There are many UK networks with a range of products available. No matter your budget, data requirements, or handset preference, you’ll be able to find the ideal package: