About O2

With 25 million customers using its network, O2 is the UK's second largest mobile phone provider, with a huge range of O2 shops across the country and a large online presence. 

You'll find regular O2 promo codes and O2 discount codes on offer to help save you more on SIM-only and contract deals, along with device accessories and handsets.

O2 Contracts

Choose an O2 contract which best matches your needs and select your desired upfront cost to adjust the monthly payment to the level you prefer. There are plenty of online tools to help and the customer services team is always on hand if you need them.

O2 Sim Cards

You can get great prices on O2 Sim only deals too on the website for tablets, dongles and phones - including pre-paid SIM deals. Pay monthly deals start at £18 for 10GB. There are international SIM deals too that start from just 1p a minute, plus business deals.

O2 Online Top Up

There are so many ways to do an O2 online top up, such as via the website, the app, a cash point, phone or voucher. On the website, you'll find full details on how to do your top up. If you want to top up online, you can add £10-£30 with your phone number and a payment card.