O2 mobile review

Before signing up for a new phone deal, read our review of O2 to see how it scored in our annual mobile network customer survey.

How good is O2 mobile?

We spoke to more than 3,300 real customers from 16 of the biggest phone providers including EE, O2, Vodafone and Three. They told us exactly what they thought of their phone company, from the customer service on offer to the value for money they get.

In this in-depth review of O2 mobile, we'll:

• give you a full breakdown of how its customers rated it for key factors, including customer service, value for money and incentives.
• report quotes from real O2 mobile customers on their experiences.
• tell you whether it's a Which? Recommended Provider.

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Browse all of O2's Sim-only deals at Which? Switch Mobile.

How good is O2's mobile coverage?

O2 has its own network and offers 2G, 3G, 4G and 5G coverage.

In our latest analysis of 4G phone coverage, performed in conjunction with coverage experts RootMetrics, we found that O2 had the weakest overall performance.

You can check coverage where you live by using our free interactive mobile network coverage map. Simply enter your postcode into the map and it will tell you how good O2's signal is in your area, as well as comparing it with the other providers.

O2's deals and incentives

O2 splits its pay-monthly 'Refresh' packages so you'll actually be signed up for two deals – one for your minutes, texts and data (the airtime plan) and one for the cost of your phone handset (the phone plan).

Once you've paid for a handset (at the end of your contract), your bill is automatically reduced. In contrast, most other providers will keep you on a higher tariff until you tell them to switch, even when you've paid off your phone – a practice we don't think is fair. Refresh also lets you easily upgrade to another phone by simply paying off the balance owed on your existing handset.

O2 is also known for offering perks, including O2 Priority. This gives customers access to a range of offers, including pre-sale tickets. There is also the O2 Rewards scheme for PAYG customers, which gives you back up to 10% of your quarterly spend on credit.

Compare the best O2 Sim-only deals and see how much you could save.

O2 stores

O2 is one of the UK's biggest mobile phone providers and has hundreds of high street stores, many of which offer technical support from the company's 'O2 Gurus'.

You can find your nearest branch using the O2 store locator or by calling O2's customer service on 202 (from an O2 mobile) or 0344 809 0202.

Find out how other providers fared in our guide to the best and worst mobile networks.