O2 offers Big Bundles on Pay As You Go with unlimited minutes & texts from £5/month. An allowance of 4G data is available from £10/month.

In the UK, O2 offers a range of Pay As You Go bundles starting from £5/month for unlimited minutes & unlimited texts. For a £10 monthly top-up, you’ll also get 6GB of data. This increases to 15GB of data for £15 and 100GB of data for £30.

Customers on O2 Pay As You Go can also benefit from rollover of unused data, access to the O2 Priority app and £10 of free credit when signing up to the service.

Get O2 Pay As You Go SIM Card (Free) →

In this article, we’ll review O2’s Pay As You Go service and the Big Bundles that are available on it. We’ll start by looking at the price plans and features available, before comparing O2’s Big Bundles to those available on other networks. Finally, we’ll look at the coverage on O2 and how you can keep your current phone number when moving to the service.

Bundles & Pricing

O2 is one of the UK’s largest Pay As You Go mobile networks.

Most Pay As You Go customers will be on the O2 Big Bundles plan. Here, you’ll top-up your phone every month, converting your credit into a 30-day allowance of minutes, texts and data. You can get unlimited UK minutes and unlimited UK texts for £5/month, with an allowance of mobile data included from £10/month.

It’s also possible to get an International Big Bundle which includes an allowance of phone calls to selected international destinations.

Big Bundles

On O2’s Big Bundles plan, you’ll convert your Pay As You Go credit into a 30-day allowance of UK minutes, texts and mobile data.

The cheapest £5/month bundle comes with unlimited minutes and texts, but with no data included on the bundle. For mobile data, you’ll need to choose a Pay As You Go bundle starting from £10/month.

The following table shows a list of O2’s current Big Bundle plans:

O2UnlimitedUnlimitedNo data£5.00

Order O2 Pay As You Go SIM Card (Free) →

You’ll currently get £10 of free credit when you order an O2 Pay As You Go SIM card on the £5, £10, £15 or £30 Big Bundle plan. Simply top-up your SIM card and text FREE10 to 21500 within 28 days of receiving your SIM.

All of your Big Bundle allowances last for 30 days. Any unused allowances will expire with the bundle, except from data which can be rolled over into the following month if you renew your bundle automatically. O2 will try to automatically renew the same bundle when your current one expires so you’ll need to top-up again before the expiry date to benefit from data rollover.

Note that the minimum top-up on O2 is £10 each time. For the £5 Big Bundle, you’ll still need to top-up by £10 each time. However, you can do this every other month. The £10 of credit from one top-up can be used over two different months (£5 for the first month’s bundle and £5 for the second month’s bundle).

International Big Bundles

O2 Cat - SIM Card

If you regularly need to make international phone calls to other countries, O2 also offers two International Big Bundles as an alternative to their regular Big Bundles.

You can choose from the following International Big Bundles:

  • £10 International Big Bundle: 500 minutes to the UK and 29 other destinations, 5000 UK texts and 5GB of UK data.
  • £20 Premium International Big Bundle: 1000 minutes to the UK and 48 other destinations, 250 additional minutes to Nigeria, Pakistan and South Africa, 5000 UK texts and 15GB of UK data.

The following destinations are included on International Big Bundles:

  • Alaska1
  • Australia1
  • Austria
  • Bangladesh1
  • Belgium
  • Brazil1
  • Bulgaria
  • Canada1
  • China1
  • Colombia1
  • Croatia
  • Cyprus
  • Czech Republic
  • Denmark
  • Estonia
  • Finland
  • France
  • Germany
  • Greece
  • Guam1
  • Hawaii1
  • Hong Kong1
  • Hungary
  • Iceland
  • India1
  • Israel1
  • Italy
  • Latvia
  • Lithuania
  • Luxembourg
  • Malta
  • Mexico1
  • Mongolia1
  • Netherlands
  • Nigeria2
  • Norway
  • Pakistan2
  • Peru1
  • Poland
  • Portugal
  • Puerto Rico1
  • Republic of Ireland
  • Romania
  • Slovak Republic
  • Slovenia
  • South Africa2
  • South Korea1
  • Spain
  • Sweden
  • US Virgin Islands1
  • USA1

1 These destinations are only included on the £20 Premium International Big Bundle.
2 On the £20 International Big Bundle, you’ll get 250 additional minutes for calling Nigeria, Pakistan and South Africa. These countries are not included within the 1000 minutes.

On the International Big Bundles, you can still benefit from data rollover and access to the O2 Priority app. However, you won’t get the £10 of free credit for signing up and activating your SIM.

If you’re calling a destination that isn’t listed above, you can check the per-minute calling rates on O2’s website.

Data Rollover

O2 offers data rollover for unused data allowances when you automatically renew your Big Bundle on Pay As You Go. The renewal needs to happen automatically so you’ll need to top-up your account with enough credit before your current bundle ends.

To give an example, if you have 2GB of remaining unused data on the £10 Big Bundle, you’d receive an extra 2GB of data in the following month’s bundle. This would increase your normal 6GB data allowance to 8GB of data.

Data rollover is capped at 100% of your normal bundle allowance. For instance, the £10 bundle normally comes with 6GB of data. You can therefore rollover a maximum of 6GB per month, making a total of 12GB per month if you do this. You’ll lose your data rollover when changing price plan or bundle, or when leaving a gap between the renewal of your bundles.

For more information, see our guide to data rollover on UK mobile networks.

Bundle Codes

If you already have an O2 Pay As You Go SIM card, you can buy a Big Bundle through the My O2 app or by sending a text message as follows:

Bundle Required Bundle Code for Opting In
£5 Big Bundle (no data included) Text BIGBUNDLE5 to 21300
£10 Big Bundle (with 6GB data) Text 10DATABB to 21300
£15 Big Bundle (with 15GB data) Text 15DATABB to 21300
£30 Big Bundle (with 100GB data) Text 30DATABB to 21300

It’s also possible to change your Pay As You Go plan by calling O2’s automated service on 2202.

If you’re an existing Pay As You Go customer wanting to opt-in to special offers, you’ll need to send a text message as follows:

O2 Pay As You Go Offer SMS Code for Opting In
£10 of free credit
(available for 28 days only after your ordering SIM through this page)
Text FREE10 to 21500

You can order a free SIM card from O2 if you don’t have one already.

Out of Bundle Charges

Top Up Logo

If you exceed the inclusive allowances on your O2 Pay As You Go Big Bundle, you’ll pay 35p/minute and 15p/text. You’ll also pay £2/day for using mobile data. These charges will also apply if you don’t have an active bundle on your account.

Because of the incredibly high £2 daily charge, we wouldn’t recommend using mobile data on your phone unless you have a Big Bundle with inclusive data. This means the £5 Big Bundle (which only includes minutes and texts) is unlikely to be suitable for anyone with a smartphone. Even very light data users will likely be better off using the £10 Big Bundle with data included.

The following table shows out-of-bundle rates on O2’s Big Bundles plan:

Calling Rates:
Voice Calls 35p/minute (any network, any time)
Calls to Voicemail 30p/call (when outside of allowances)
Calls to Special Rate Numbers 55p/minute access charge
+ service charge from the company you’re calling
Messaging Rates:
Text Message (SMS) 15p
Picture Message (MMS) 45p
Internet Rates:
Mobile Data £2/day

The prices in this table are stated for UK-to-UK only. If you’re travelling abroad or making an international phone call, higher charges will normally apply. Source for pricing information: O2 [1, 2].

Outgoing phone calls are charged for on a per-minute basis. This means the length of all phone calls will be rounded up to a full minute before the charge is calculated and deducted from your account. For instance, a 61-second phone call will be charged as 2 complete minutes (2 minutes x 35p/minute = 70p). There is also a minimum call charge equivalent to 1 minute, so you’ll pay a minimum amount of 35p per call.

Classic Pay As You Go

O2 Classic Pay As You Go

Previously, O2 offered a Classic Pay As You Go plan where it wasn’t necessary to top-up your phone every month. Instead, you could use your phone at a simple rate of 3p/minute, 2p/text and 1p/MB.

Unfortunately, the Classic Pay As You Go SIM card was withdrawn from sale in November 2019. If you’re looking for a similar plan, consider getting a 1pMobile SIM card instead (they charge 1p/minute, 1p/text and 1p/MB with coverage from EE).

For more information, see our guide to traditional Pay As You Go tariffs in the UK.

A Cheaper Alternative

For a better value alternative to O2’s Big Bundles, consider joining giffgaff instead and getting one of their Pay As You Go bundles.

A low-cost sub-brand of O2, giffgaff has goodybag bundles that are available from just £6/month. Furthermore, as they use O2’s network for coverage, you’ll get a signal in the same places you would on O2.

At present, giffgaff offers a £10 golden goodybag which gives you 9GB of data with with unlimited minutes and unlimited texts (increased to 10GB per month automatically from your third month onwards). This compares to the 6GB of data you’ll get on O2.

£6 GoodybagUnlimitedUnlimited500MB£6.00
£8 GoodybagUnlimitedUnlimited3GB£8.00
£10 Golden GoodybagUnlimitedUnlimited9GB£10.00
£10 GoodybagUnlimitedUnlimited6GB£10.00
£12 GoodybagUnlimitedUnlimited10GB£12.00
£15 Golden GoodybagUnlimitedUnlimited25GB£15.00
£15 GoodybagUnlimitedUnlimited15GB£15.00
£20 Golden GoodybagUnlimitedUnlimited100GB£20.00
£20 GoodybagUnlimitedUnlimited80GB£20.00
£25 GoodybagUnlimitedUnlimitedAlways-On£25.00
£35 Golden GoodybagUnlimitedUnlimitedUnlimited£35.00

Customers without a goodybag bundle will pay 25p/minute, 10p/text and 5p/MB. You’ll also get free giffgaff-to-giffgaff calls and text messages providing you’ve topped up your phone at least once in the past 3 months.

For more information, read our giffgaff review. Alternatively, you can order a free Pay As You Go SIM card from giffgaff’s website.

Comparison to Alternatives

In the following section, we’ll compare O2’s Big Bundles to rival offerings from other mobile networks.

£5 per month bundles

5 Pound NoteO2’s entry-level £5 Big Bundle comes with unlimited minutes, unlimited texts and no data. This bundle is only really suitable if you don’t want to use data when you’re away from the home (as you’ll pay £2/day for accessing the internet on this plan).

An alternative option is giffgaff’s £6 goodybag. This gives you unlimited minutes, unlimited texts and 500MB of data so you can still use data when you’re away from home. The coverage on giffgaff also comes from the O2 network.

O2UnlimitedUnlimitedNo data£5.00

£10 per month bundles

10 Pound Note

At the £10/month price point, O2 is currently offering a Big Bundle with unlimited minutes, unlimited texts and 6GB of data.

giffgaff offers a £10 golden goodybag at this price point. It comes with 9GB of data (increased automatically to 10GB from your third month onwards). This is 50% more data than you’d get on O2, for the same price of £10 per month.


£15 per month bundles

15 Pound NotesO2 offers a £15 Big Bundle with unlimited minutes, unlimited texts and 15GB of data.

Around this price point, you can also consider VOXI’s £15 bundle which come with unlimited minutes, unlimited texts, 15GB of data and endless social media data.


£20 per month bundles

20 Pound NoteO2 doesn’t currently offer any Pay As You Go bundles at the £20 price point. Instead, the next bundle up costs £30/month for unlimited minutes, unlimited texts and 100GB of data.

For £20/month, some worthwhile alternatives are available elsewhere. For instance, giffgaff’s £20 goodybag comes with unlimited minutes, unlimited texts and 80GB of data. Alternatively, a £25 goodybag with Always-On data is also available (giving you unlimited downloads with 4G speeds on the first 80GB per month).


For more information, see our full comparison of the UK’s best value Pay As You Go bundles.


2G, 3G and 4G Coverage

In the UK, O2 offers 99% population coverage on their 2G, 3G and 4G mobile networks. Customers on O2’s Pay As You Go service are able to access this 2G, 3G and 4G coverage from O2.

Before signing up to the Big Bundles plan, we’d strongly recommended double-checking O2’s coverage in your area. You can do this by entering your postcode on O2’s online coverage map:

Check O2 Coverage (o2.co.uk) →

We’d typically recommend joining O2 only if you’re able to get 3G or 4G coverage when indoors.

You’ll get the exact same coverage when using a SIM card from giffgaff so this can save you a little bit of money if you’re looking for coverage from O2. Our in-depth guide to the coverage on O2 has more information.

5G Coverage

Unfortunately, 5G coverage isn’t currently available to customers on O2’s Pay As You Go service. Instead, the maximum download speeds on O2 Pay As You Go are currently limited to 4G.

O2 has recently launched 5G coverage in a number of UK towns and cities, but you’ll need to a 5G-ready Pay Monthly plan to get access it in the following locations:

Now Live155 towns and cities are live on O2 5G (May 2021)
Aberdeen, Ambleside, Ashford, Aughton, Aylesbury, Banstead, Basildon, Basingstoke, Beaconsfield, Bedford, Belfast, Bilston, Birkenhead, Birmingham, Blackburn, Blackpool, Blaydon, Bolton, Bournemouth, Bradford, Bradley Stoke, Bridge of Don, Brighton, Bristol, Brombourgh, Bury St Edmunds, Byfleet, Cambridge, Cardiff, Chadwell St Mary, Chatham, Chelmsford, Cheltenham, Chesterfield, Chipstead, Clacton-on-Sea, Colchester, Coventry, Darlington, Dartford, Derby, Dewsbury, Dinas Powys, Doncaster, Dudley, Dundee, Dunstable, Durham, Dyce, Eastbourne, Edinburgh, Egham, Epsom, Esher, Eton, Falmer, Gateshead, Gatton Bottom, Gillingham, Glasgow, Gloucester, Gravesend, Grays, Great Yarmouth, Halifax, Harlington London, Harlow, Hastings, Hebburn, Hemel Hempstead, Hextable, High Wycombe, Hove, How Wood, Huddersfield, Hull, Inverness, Ipswich, Iver, Jarrow, Lancaster, Leeds, Leicester, Lincoln, Lisburn, Liverpool, Llandudno, London, Longford, Loughborough, Lowestoft, Luton, Maidstone, Manchester, Mansfield, Middlesbrough, Milton Keynes, Monifieth, Morley, Musselburgh, New Denham, Newbury, Newcastle, Newtownabbey, North Shields, Northampton, Norwich, Nottingham, Nuneaton, Orpington, Oxford, Peterborough, Plymouth, Portsmouth, Potters Bar, Rainham, Reading, Redhill, Rochdale, Rotherham, Royal Tunbridge Wells, Rugby, Salford, Sheffield, Shepperton Green, Slough, Solihull, South Shields, Southampton, Southend-On-Sea, Staines-upon-Thames, Stevenage, Stockport, Stockton-on-Tees, Stoke-on-Trent, Stranraer, Sunbury, Sunderland, Swansea, Swindon, Thundersley, Tynemouth, Wakefield, Warrington, Washington, Watford, Wavertree, West Bromwich, Weybridge, Whickham, Whitley Bay, Windsor, Wolverhampton, Worthing, York
Planned &
2 towns and cities planned
Guildford, Kingston-upon-Thames (2021)

For more information, see O2’s web page on 5G. This has a full list of compatible 5G handsets and price plans.

Tethering & Personal Hotspot

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).

You can tether without any restrictions on O2 Pay As You Go. This allows you to share your Big Bundles data allowance with other devices. If you’re using an older version of the iPhone, however, you may experience problems with this if your handset isn’t running iOS 10.1 or newer, with version 26.1 or later of the O2 carrier settings.

For more information, see our in-depth article about tethering on UK mobile networks. You can also see our guide to mobile broadband services in the UK.

Joining Big Bundles

Customers who are new to O2 can join Big Bundles in one of two ways.

If you already have a mobile phone that you’d like to use on O2, you can simply order a free Pay As You Go SIM card for it. Before you set up the SIM card, you’ll need to make sure your handset is unlocked. For more information, you can read our step-by-step guides to unlocking an iPhone and unlocking a Samsung Galaxy smartphone.

If you’d like a new mobile phone to use on O2, it’s possible to buy a Pay As You Go smartphone from O2’s website. Prices range from about £20 for a basic Pay As You Go smartphone, all the way up to more than £1,000 for the latest flagship iPhone.

Keeping Your Phone Number

It takes around one working day to transfer your phone number over to O2 Pay As You Go.

If you’re switching from another mobile network to O2, it’s a straightforward process to keep your current phone number.

To do so, you’ll need to ask your current mobile network to provide you with a PAC Code. You can get this through your mobile network’s website or application, or by texting PAC to 65075.

Once you have the PAC Code from your old mobile network, order your new Pay As You Go handset or SIM card from the O2 website. When it arrives, you can provide the PAC Code to O2 through this online form. Once you’ve submitted the form, the phone number transfer will be scheduled, normally for the next working day.

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

Unfortunately, it isn’t possible to move Pay As You Go credit from your old mobile network to O2. For this reason, you should try to use it up before moving your phone number to O2. This is because the account on your old mobile network will be deactivated after you use your PAC Code, resulting in the loss of any unused Pay As You Go credit.

Frequently Asked Questions

What Pay As You Go bundles are available on O2?
O2 currently offers the four following Pay As You Go bundles:
  • £5 Big Bundle: Unlimited minutes, unlimited texts and no data.
  • £10 Big Bundle: Unlimited minutes, unlimited texts and 6GB data.
  • £15 Big Bundle: Unlimited minutes, unlimited texts and 15GB data.
  • £30 Big Bundle: Unlimited minutes, unlimited texts and 100GB data.

You can also get an International Big Bundle which comes with minutes for calling the UK and either 29 or 48 international destinations.

How do I get £10 of free credit on O2 Pay As You Go?
When you order an O2 Pay As You Go SIM card through this link, you can get £10 of free credit when you activate and top-up your SIM card within 28 days of getting it. Once you’ve done this, text FREE10 to 21500 to claim your £10 of free credit.
How much do I need to top-up by each time?
You’ll need to top-up your SIM card with at least £10 of credit each time. If you choose the £5 Big Bundle, this top-up can give you two months of usage.
What are the standard Pay As You Go rates on O2?
If you don’t have an active Pay As You Go bundle on your account, you’ll pay 35p/minute and 15p/text. You’ll also pay £2/day for using mobile data on your phone. Because this is fairly expensive, we’d recommend using mobile data only if you have an active bundle on your account.
What coverage will I get on O2 Pay As You Go?
You’ll get 99% population coverage on O2’s 2G, 3G and 4G mobile networks in the UK. You can check the availability of coverage in your area by entering your postcode on O2’s online coverage map.
Will I get access to 5G on O2 Pay As You Go?
No. 5G coverage isn’t currently available on O2 Pay As You Go. You’ll need to choose an O2 Pay Monthly plan if you’d like to access 5G coverage on the O2 network.
Can I keep my current phone number?
Yes. It’s easy to keep your current phone number. Simply ask your current mobile network to provide you with a PAC Code. This can be obtained through your mobile network’s website or app, or by texting PAC to 65075. You should then provide O2 with this PAC Code after ordering your Pay As You Go plan.

More Information

For more information about Big Bundles, please see O2’s official website. You can also order a free O2 Pay As You Go SIM card.

Your Comments 93 so far

We'd love to hear your thoughts and any questions you may have. So far, we've received 93 comments from readers. You can add your own comment here.

  • If I got the £10 deal which is unlimited calls & text plus 6Gb data would that bring my account balance down to £0.00 ?
    Like if I paid £3.00 on top of that for the International Bolt On 0.01p per minute would I need to have additional funds in my account? Or does it use the £10 that I put in for the bundle. Nothing really explains how all of that works.

    • Hi Spencer,
      Thanks for your comment. Yes, if you topped up by £10 and bought the £10 Big Bundle, that would reduce your account balance to zero. You’d then need to add additional money for other things (e.g. for buying the International Bolt-On or paying for your international calls).
      As an example, you could decide to top-up your account with £15 to buy the £10 Big Bundle. This would give you £5 leftover to pay for other bolt-ons, calls, etc.
      Hope this helps,

  • It’s irritating that o2 have got rid of the Classic PAYG. I no longer have a landline, as it was expensive and I was hardly using it. Instead, I back up my smartphone with a cheap moblle for emergency, e,g losing the smartphone. I rarely use the cheap phone and as it is on Classic, I hardly ever top it up. An occasional call to my smartphone keeps the plan active. Now Classic is no longer available to new users. I do realise that I can still continue with Classic, at least for the moment. I use Big Bundles £15 for the smartphone.

    • Malony,

      Although O2 does not sell classic PAYG SIM cards, you can still order one (with a big bundle), call them on 4445 and ask them to remove the Big Bundle before you top up the card. That way you can use it the old way.

  • I see the SIM cards for this plan are still available on ebay. I saw someone say they have an expiry on Dec 2020 (when they were for sale in Asda) and an ebay seller say as long as you top up by April 2021 they are valid. Reviews on ebay suggest that you can get this plan by activating a SIM off ebay even as a new customer. Do you know if that is true? Thanks

    • Hi R,
      Are you referring to Big Bundles or Classic Pay As You Go? For Big Bundles, you can get a SIM card from O2 for free online. However, Classic Pay As You Go SIM cards are no longer available directly from O2. If you find one (e.g. on eBay), I believe it’s still possible to activate it as long as the SIM pack is still valid and as long as it hasn’t expired.

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