O2 pay monthly, pay as you go and business customers can use their texts, calls and data allowance for no extra charge in a range of European and a smattering of non-EU locations, in what O2 dubs its 'Europe Zone'.
Customers looking to travel outside the Europe Zone, there are O2 Travel add-ons. Priced between £3.99-£4.99 per day, these let you use as much as data you like while you're away.
They also include 120 minutes which you can use to make and receive calls, as well as 120 texts to send to mobiles in your holiday destination and to phones in your home country.
Find out more in our O2 international roaming FAQ.
All calls made to O2’s customer service helpline are free when made from a pay monthly handset. This is applicable both in the UK and abroad. The service is open between 8am and 8pm Monday to Friday and from 9am and 6pm at weekends. You can reach them by ringing 202 from your mobile phone.
Alternatively, you can ring from a landline on: 0344 8090202. Calls are charged at standard network rates.
If you purchased your mobile through O2.co.uk, the company’s customer service department can be reached on 087 0600 3009 or by calling 202 from your handset.
O2 customers benefit from free delivery on the latest handsets, the company’s O2 Reward Club scheme as well as exclusive invitations to O2 events. Visitors to the company’s entertainment-outpost the O2 arena can even access exclusive content when they are there.
The O2 website is home to a range of how-to guides to help you to deal with everything from getting the most out of O2 services, setting up your mobile phone, billing and procedures for when your mobile phone is lost or stolen.
O2 offers Pay Monthly, Pay As You Talk and SIM only price plans.
The Pay Monthly plans feature a range of options for combinations of calls and minutes, and the deals run over 18 and 24 month contracts.
Starting at just £18.50 per month on an 18 month contract, or £13.50 on a 24 month contract, the Basics package offers 50 minutes, 250 texts, and 100MB of data.
Pay As You Go call charges start at 35p per minute and 12p per text, but bolt-ons are available with every top up, so with a top up of £7.50 you can receive unlimited texts, and for £10 you can receive 500 minutes of O2-O2 and standard landline calls.
The SIMplicity package starts at £3 per month, and offers customers a SIM only deal with a number of text, call and data bolt-ons available.
O2’s network offers 97% 4G population coverage across the UK to all its customers. So whether you’re on a monthly phone contract or a pay as you go SIM-only deal, you’ll receive the same level of coverage.
However, to make sure your location has the quality and breadth of coverage you require it's a good idea to take a look at Ofcom’s coverage checker or use O2's coverage checker before you commit to a purchase.
When customers are out and about, they also get use of the O2 Wi-Fi network of thousands of hotspots in a range of high-street shops and restaurants, including McDonalds, Debenhams, Costa Coffee, House of Fraser and Café Rouge.
The standard, nationally available O2 4G service gets you a maximum connection speed of up to 15.06Mbps.
O2 allows Pay Monthly and Pay As You Go customers to use their phones as a portable hotspot to get online on laptops, tablets and any other wireless-enabled devices.
But if you're an iPhone owner and a pay as you go customer, you may need to update your software.
Naturally, tethering your phone to other gadgets can eat into your data allowance pretty quickly. So it's best to use it sparingly, unless you've got a large data allowance and a lot of it usually goes unused.
O2 Refresh early upgrades
Like similar schemes from rival networks, O2 Refresh is a programme that lets customers upgrade to a new phone at any time.
It does this by decoupling the cost of the phone from the cost of your allowances. So you've effectively got two contracts running concurrently: a device plan and an airtime plan. If you want to upgrade, you trade-in your existing phone and pay off whatever remains.
At the time of writing, O2 is offering existing O2 customers who aren't on Refresh contracts and whose contract ends before 5th March 2018, the option to upgrade for no charge. Customers whose contract ends after that get 25% off their remaining contract at the point they upgrade.
Want more about O2 Refresh? Here's everything you need to know.