O2 offers a ‘Classic Pay As You Go’ tariff charging 3p/minute, 2p/text and 1p/MB. Customers get 4G coverage and access to O2 Priority.

O2 Classic Pay As You Go

In the UK, O2 offers a Pay As You Go tariff known as Classic Pay As You Go. Designed for light mobile users, the tariff has no regular monthly charges. Instead, customers only pay for what they actually use at the rates of 3p/minute, 2p/text and 1p/MB.

Customers on Classic Pay As You Go have full access to O2’s network, including 2G, 3G and 4G coverage. They also qualify for Priority, O2’s exclusive customer offers programme. This comes with a number of benefits such as a free hot drink from Caffè Nero most Tuesdays.

In this article, we’ll review O2’s Classic Pay As You Go tariff. We’ll start by looking at how much it costs and at the features and benefits of the tariff. We’ll then compare it to the deals available on other mobile networks before discussing coverage and how you can keep your existing phone number when moving to Classic Pay As You Go.


Classic Pay As You Go

On O2’s Classic Pay As You Go tariff, it’s possible to use your mobile phone without buying a regular monthly bundle. Instead, you’ll only pay for what you actually use at the rates of 3p/minute, 2p/text and 1p/MB:

Calling Rates:
Voice Calls 3p/minute (any network, any time)
Calls to Voicemail 3p/call
Calls to Special Rate Numbers 55p/minute access charge
+ service charge from the company you’re calling
Messaging Rates:
Text Message (SMS) 2p
Picture Message (MMS) 45p
Internet Rates:
Mobile Internet 1p/MB

The prices in this table are stated for UK-to-UK only. If you’re roaming outside Europe or making international phone calls, higher charges will normally apply. Source for pricing information: o2.co.uk.

It’s worth noting that mobile data charges are deducted from your credit each time you use a 20MB block of data or each time your data session ends. The cost of your data sessions will be rounded up to the nearest full penny before being the charge is deducted from your credit balance.

Prior to the 18th January 2018, customers on Classic Pay As You Go were charged 5p/minute, 5p/text and 5p/MB.

Credit Expiry & Inactivity

Top Up LogoUnlike many other Pay As You Go offerings that revolve around the purchase of 30-day bundles, O2’s Classic Pay As You Go doesn’t require you to buy time-limited bundles. Instead, your top-up remains as credit on your account until the time you want to use it.

Your Pay As You Go credit doesn’t expire providing you keep your SIM card active by using it at least once every six months. Each time you add money to your SIM card, there’s a minimum top-up of £10.

For more information, see our in-depth guide to credit expiry and inactivity on UK Pay As You Go networks.

O2 Priority

O2 Cat - Priority Caffe Nero
Benefits of O2 Priority include a free hot drink from Caffè Nero on most Tuesdays.

As a customer of O2 Classic Pay As You Go, you’ll have access to O2’s exclusive Priority offers.

Offers available through the O2 Priority app typically include a free hot drink from Caffè Nero on most Tuesdays. You can also get a £5 main course from Pizza Express each week, with offers from other major brands like Halfords and WHSmith rotating on the app.

In our opinion, the access you’ll get to O2 Priority is a strong reason for choosing it over some other Pay As You Go networks. The potential savings you’ll get from O2 Priority may even pay for your phone bill (e.g. taking advantage of a free Caffè Nero each week would already save you close to £10 per month).

Big Bundles

If you’re a smartphone owner or regular mobile user, you might find yourself better off buying an O2 Big Bundle.

On Classic Pay As You Go, your £10 of credit will convert to 333 minutes, 500 texts or 1GB of data (in reality, it will probably be some combination of the three things).

With Big Bundles, you’ll instead convert a certain amount of credit into a 30-day allowance. As you’re buying your airtime in bulk, you’ll get much larger allowances for the same amount of money. For instance, you can get 250 minutes, 1000 texts and 2GB of data for a £10 top-up. The disadvantage of choosing a Big Bundle over Classic Pay As You Go is that unused allowances will expire at the end of your 30-day bundle.

At present, O2 offers a choice of five Big Bundle packages:


One thing that’s worth being aware of is you’ll pay higher out-of-allowance rates when on the Big Bundles tariff (35p/minute, 15p/text and £1/day for 50MB data). It’s not possible to retain Classic Pay As You Go rates when on the Big Bundles tariff.

Comparison to Alternatives

At 3p/minute, 2p/text and 1p/MB, O2 has some of the lowest Pay As You Go rates available in the UK. Three offers the same rates on their 321 tariff but with more limited coverage compared to O2 (e.g. Three doesn’t provide any 2G coverage as a fallback and also has a lower proportion of 4G coverage).

One network that does offer slightly lower rates is 1pMobile, a virtual network operator from the sister company of Utility Warehouse. 1pMobile charges 1p/minute, 1p/text and 1p/MB so is cheaper if you often make phone calls. However, a condition of the tariff is you’ll need to top-up by at least £10 every 120 days. 1pMobile makes use of coverage from EE (including 2G, 3G and 4G coverage).

If you’re a regular mobile user or smartphone owner, a Pay As You Go bundle will normally offer better value compared to traditional Pay As You Go. For instance, the following table shows what you could get for a £10 monthly top-up:

ASDA Mobile600Unlimited4GB£10.00

Our recommended £10/month bundle is giffgaff’s £10 goodybag. A low-cost sub-brand of O2, giffgaff offers unlimited minutes, unlimited texts and 3GB of internet for £10. As giffgaff makes use of the O2 network, members of giffgaff get the exact same coverage as customers on O2.

Order giffgaff SIM card (free) →

For more information, please see our full comparison of classic Pay As You Go tariffs and monthly Pay As You Go bundles.


2G, 3G and 4G Coverage

Customers on Classic Pay As You Go will have access to O2’s UK-wide network. At the time of writing, O2 offers 99% population coverage (including 98% coverage on 3G and 97% coverage on 4G).

Before joining Classic Pay As You Go, we strongly recommended checking the coverage in your area. You can do this by entering your postcode on O2’s online coverage map:

Check O2 Coverage (o2.co.uk) →

For more information, please see our in-depth article on mobile phone coverage in the UK.


Tethering or personal hotspot refers to the process of sharing your smartphone’s internet connection with other devices (e.g. with your laptop or tablet).

Tethering is permitted on O2 Classic Pay As You Go. However, the charge of 1p/MB for mobile data usage can quickly add up if you tether on a regular basis. If you’d like a better value Pay As You Go network for tethering, we recommend giffgaff as an alternative (giffgaff provides 3GB of tetherable data for £10/month).

For more information, please see our in-depth article about tethering on UK mobile networks.

Keeping Your Phone Number

If you’re switching from another mobile network to O2 Pay As You Go, it’s a straightforward process to keep your existing phone number.

To do this, start by contacting your current mobile network and asking them for a PAC Code. Your current network needs to provide you with a PAC Code free of charge within two hours of your request.

Once you have a PAC Code from your old mobile network, order your new Pay As You Go SIM card from O2’s website. When your new SIM card arrives, give the PAC Code to O2 by submitting it through this online form. Your phone number transfer will normally take place on the next working day after you submit your PAC Code.

Please be aware that it isn’t possible to transfer credit from your existing mobile network to O2. For this reason, you should try to use up your credit before moving your phone number to O2.

For a step-by-step guide on moving your phone number to O2, please select your current mobile network from the drop down menu below:

PAC Code Finder: Transfer Your Phone Number to O2

Select your current mobile network:

  More Options

More Information

For more information about Classic Pay As You Go, please see O2’s official website.

Your Comments 78 so far

We'd love to hear your thoughts and any questions you may have. So far, we've received 78 comments from readers. You can add your own comment here.

  • TIA-IsTheNewOverseer said:

    O2’s terms and conditions and privacy policy are interesting. Their Privacy Policy actually is abusive and contrary to the GDPR (which requires active consent for data sharing).
    It states that it will track your geolocation via cell tower with precision, then SHARE THIS DATA COMMERCIALLY (sell it to anyone who wants to buy it). IIRC. I was shocked at the disrespect for customers’ privacy. Check it out for yourself. It didn’t look like it had been updated in a long time, mind-you.

    • Hi there,
      Thanks for your comment. Yes, I know the mobile networks previously did a lot of experimentation with trying to monetise the location data they collect. I suspect, however, the personally identifiable information isn’t being shared directly with third-parties (as that would be a breach of GDPR like you say). It might be worth getting in touch with O2 to clarify this information for yourself before signing up if you have concerns.

  • My wifes been on O2 classic since it got launched back in Nov 2016, having changed from one of their then expensive PAYG tarrifs (25p+ per min iirc!). She has still not used all the credit up since then, and never topped up! Still working fine.

    In the distant past we fell foul of the 999 day rule on top ups, a quick call to customer services soon fixed everything and was told then that O2 had decided to change the top up timeout to 9999 days and it now applied to her sim as well

    Its been more than 999 days since last top up.

  • Christopher Pugh said:

    Hi Ken,
    Despite the confusing terms and conditions, I have decided to join O2. After applying online, my Classic PAYG SIM card has arrived. I also received an email from O2, saying that, if I topped up £10 and then texted FREE10 to 21500, I would receive an extra £10 credit free of charge. It worked! I now have £20 on my account. I think that you have to apply online to get this offer, don’t buy a SIM from a Supermarket. Also, the text must be sent from the SIM’s original number, not from one ported in from another network. However, O2 has told me, via Twitter, that a number can be ported in after receiving the credit.

    • Hi Christopher,
      Yes, there are definitely some nice bonuses available when you order a SIM card online 🙂 I think you can also get an extra £5 of credit for free when you sign up for My O2. Plus there’s another 5% extra when you opt-in to O2 Rewards, giving you a total of £25.50 credit (£10 + £10 + £5 + £0.50) for an initial top-up of £10 😉

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