Three offers unlimited data from £16 per month with 5G coverage, roaming and personal hotspot.

ThreeIn the UK, Three now offers an unlimited data plan from only £16 per month. It gives you access to Three’s 5G network in 194 UK towns and cities, along with 99.8% population coverage on Three’s 4G network.

One of the main benefits of choosing an unlimited data plan on Three is that you’ll be able to use it without fair usage limits or speed restrictions. You’ll also get inclusive roaming in 71 destinations around the world. There is also a selection of 4G and 5G home broadband plans with unlimited data.

In this article, we’ll review unlimited data on Three. We’ll start by looking at Three’s unlimited data plans and the inclusive features you’ll get with it. We’ll then compare it to what is available on other mobile networks, before looking at the coverage you can expect on Three. Finally, we’ll look at how you can keep your current phone number when joining Three.

Prices From: £16 per month
Contract Length: 1 month, 12 month or 24 month contract
Inclusive Features:
Fair Usage: No fair usage limits or speed restrictions. Personal use only.
Exclusive Offer: Unlimited Data SIM card for £16/month
(12 month contract with 5G at no extra cost & roaming in 71 destinations)
Alternative Deal: £10/month for 6 months, then £20/month
(24 month contract with average cost of £17.50 per month)

Three Unlimited Data Plans

In the UK, Three currently offers an unlimited data SIM card for only £16 per month. This is available as an exclusive offer when you order through this link. The plan gives you unlimited minutes, unlimited texts and unlimited data, with access to Three’s 5G network in the UK.

As an alternative, Three also offers a 24-month plan with an introductory price of £10/month for the first 6 months, followed by £20/month for the remainder of your contract. This allows you to save money in the short term, but you’ll pay more overall (as the average monthly cost is £17.50 over the length of the plan). A shorter one-month rolling plan is also available.

The following table shows Three’s unlimited data plans:

12 months
24 months
1 month

Get Unlimited Data on Three →

In addition, you can also get unlimited data on a range of Pay Monthly phones including the latest iPhone and Samsung Galaxy handsets.

Three also offers unlimited data on a Pay As You Go basis, but you’ll need to pay £30 per month for this so you’ll be a lot better off choosing the one-month contract instead.

Along with their unlimited data plans for mobile, Three also offers a 4G home broadband and 5G home broadband service. Both of these will give you unlimited data to use across all of your devices at home, without the need for a landline. For more information, read our Three broadband review. There’s also a mobile broadband service with the Huawei 4G Plus MiFi which gives you broadband on-the-go.

Download Speeds

All of Three’s unlimited data SIM cards are 5G ready and do not have any speed limits or fair usage policies within the UK. This is confirmed on Three’s website:

How unlimited is Unlimited data?
Our Unlimited data plan is the best, because it’s truly unlimited. We’ve got no speed tiers, data caps, throttling or any of that trash.

Is there any limit on Unlimited data?
There’s no hidden caps or limits when you use Unlimited in the UK. You’ll get all the access to the internet you’d normally need, without hefty bills. So you can binge to your heart’s content. But use of our services for commercial, resale or fraudulent purposes isn’t allowed. You can read more about this in our Terms for Three Services.

If you’re connected to Three’s 5G network in 194 UK towns and cities, you can expect average download speeds of around 201Mbps. Peak speeds can reach up to 1,000Mbps (1Gbps) on 5G. Three’s 5G network uses 100MHz of contiguous spectrum, allowing them to offer download speeds that are up to twice as fast as on other networks.

If you’re using Three’s 4G network, it’s possible to get download speeds of up to 300Mbps. On 4G, speeds can vary substantially depending on your location but will typically be in the region of 20-30Mbps.

Fair Usage Policy

Within the UK, there is no fair usage limit for unlimited data on Three. The main restriction is you can’t use the service for “commercial, resale or fraudulent purposes”.

Prior to September 2019, Three had a 1,000GB per month threshold which was used to identify non-permitted commercial usage of their service. This 1,000GB per month threshold is no longer in use, with Three confirming there are no data caps for unlimited data users.

If you’re travelling abroad outside the UK, a fair usage policy will apply. This is 20GB per month when you’re travelling inside Europe and 12GB per month when you’re travelling outside Europe. Data speeds may also be slower when you’re abroad unless you have a Data Passport add-on. For more information, see our guide to Three’s Go Roam service.

Three has been offering unlimited data plans in the UK since 2010. These plans were previously referred to as all-you-can-eat data plans to emphasise the fact there were no fair usage limits.

Comparison to Alternatives

At present, Three offers an unlimited data SIM card for only £16 per month when you order through this link. This is currently the UK’s best value unlimited data plan, particularly as you get access to 5G coverage on it.

12 months

Get Three Unlimited Data SIM Card →

If you’re looking for a shorter one-month rolling plan, Three’s £24 plan is a comparatively expensive option. Instead, you could consider getting an unlimited data plan from either SMARTY or Superdrug. Both of them offer unlimited data at a lower monthly price using 4G coverage from the Three network.

1 month
Superdrug MobileUnlimitedUnlimitedUnlimited£20.00
1 month
1 month

On Superdrug Mobile, you’ll get £20 back in Health & Beautycard points when you sign up, essentially making your first month free. On both SMARTY and Superdrug, there’s no credit check required and you can cancel your plan at any time without any penalties.

Other Mobile Networks

If you’re also considering other mobile networks for an unlimited data plan, the following table shows a side-by-side comparison of your other options:

12 months
iD MobileUnlimitedUnlimitedUnlimited£16.00
12 months
1 month
Superdrug MobileUnlimitedUnlimitedUnlimited£20.00
1 month
2Mbps max
24 months
1 month
Lebara MobileUnlimitedUnlimitedUnlimited£25.00
1 month
10Mbps max
24 months
Tesco MobileUnlimitedUnlimitedUnlimited£27.50
18 months
6 months half price
24 months
24 months
1 month
24 months

For more information, see our full guide to unlimited data plans in the UK. We’ve also got an in-depth guide on 5G unlimited data plans.

Network & Coverage

3G & 4G Coverage

In the UK, Three offers 99.8% population coverage on its 4G network and 98.7% population coverage on its 3G network. Customers with an unlimited data plan on Three can access uncapped download speeds on both 3G and 4G.

Before joining Three, we’d strongly recommend checking the coverage in your area. You can do this by entering your postcode on Three’s online coverage map:

Check Three Coverage ( →

For more information, see our full guide on Three’s mobile network coverage.

5G Coverage

Customers with a 5G-ready device will also be able to access Three’s 5G network with an unlimited data SIM card. This offers download speeds in the region of 150-250Mbps with peak download speeds of up to 1Gbps (1,000Mbps).

To access Three’s 5G network on your phone, you’ll need to be in one of the following 194 UK towns and cities:

Now Live194 towns and cities are live on Three 5G (July 2021)
Aberdeen, Abingdon-on-Thames, Adlington, Aldershot, Aldridge, Ashford, Balloch, Barnsley, Barrow-in-Furness, Basildon, Bath, Bedford, Belfast, Belfast Airport, Billericay, Billingham, Birdwell, Birkenhead, Birmingham, Bishopthorpe, Blackburn, Blackpool, Borehamwood, Bournemouth, Bradford, Brentwood, Brighton, Brimington, Bristol, Bromsgrove, Brookmans Park, Broughton Astley, Burton upon Trent, Campton, Cannock, Cardiff, Carlisle, Castlereagh, Chatham, Chelmsford, Cheltenham, Chesham, Chorley, Christleton, Clayton-le-Woods, Clifton, Coedkernew, Colchester, Copmanthorpe, Corringham, Coventry, Crawley, Crook, Cullingworth, Danderhall, Delph, Denholme, Derby, Dewsbury, Dinnington, Doncaster, Dundee, East Kilbride, East Midlands Airport, Edinburgh, Egginton, Ellesmere Port, Exmouth, Falkirk, Gateshead, Glasgow, Gorebridge, Grays, Greenock, Grimsby, Guildford, Hamilton, Hartley, Hatfield, Heanor, Heathcote, Hedge End, Hemel Hempstead, Hertford, Heswall, Heywood, Horley, Horwich, Huddersfield, Hull, Huntingdon, Inchinnan, Ingleby Barwick, Ipswich, Irlam, Isle of Grain, Iver, Kings Hill, Kings Langley, Kinmel Bay, Kirkheaton, Kirknewton, Knowl Wall, Leeds, Leicester, Leyland, Lincoln, Liverpool, London, Loughborough, Lower Stondon, Luton, Maidenhead, Maidstone, Manchester, Mansfield, Margate, Marlow Bottom, Marston Moretaine, Merthyr Tydfil, Middlesbrough, Milnrow, Milton Keynes, Motherwell, Neston, Newark-on-Trent, Newcastle, Newhall, Newport, Newquay, Newton Aycliffe, Newton-le-Willows, Newtownabbey, Normanton, Northampton, Nottingham, Nuneaton, Ottershaw, Oxford, Peterborough, Plymouth, Pontefract, Porthcawl, Portsmouth, Preston, Reading, Redcar, Redditch, Royston Yorkshire, Scunthorpe, Sheffield, Shelly Green, Shrewsbury, Slough, South Heighton, South Kirkby, South Normanton, South Ockendon, Southampton, Southend-on-Sea, Southport, St Albans, St Blazey, St Columb Road, Stafford, Stansted Airport, Stevenage, Stockton-on-Tees, Stoke-on-Trent, Stratford-upon-Avon, Sunderland, Sunninghill, Sutton-in-Ashfield, Swadlincote, Swindon, Swinton, Tamworth, Telford, Thornaby-on-Tees, Ullesthorpe, Wakefield, Wallingford, Walton-on-Thames, Warrington, Washington, Westhoughton, Weybridge, Wickford, Wigan, Winterbourne, Worcester, Worksop, Writtle, York

Check 5G Coverage on Three →

For more information, see our guides to 5G on Three and 5G coverage in the UK.

Tethering & Personal Hotspot

Tethering or personal hotspot refers to the process of sharing your smartphone’s internet connection with another device (e.g. with your laptop or tablet). It’s a convenient way to share your unlimited data allowance with other tethered devices.

There’s no limit to how much data you’re able to share through tethering or personal hotspot on your phone. There’s also no limit on how many devices you’re able to connect at the same time, unlike other networks like EE and O2 that have a limit of 12 devices.

Prior to October 2018, Three had a separate 30GB data allowance for tethering on their unlimited data plans. This was scrapped for all customers in 2019 as a result of net neutrality. You can therefore now use as much data as you like for tethering and personal hotspot.

International Coverage

On Three’s unlimited data plans, you’ll get international roaming at no extra cost through the Go Roam Around The World offer. This allows you to use your UK allowances when you’re travelling abroad in 71 destinations including most of Europe, the USA and Australia.

A fair usage policy applies when you’re travelling abroad. Within Europe, the fair usage limit is 20GB per month. Further data usage beyond this 20GB limit is surcharged at 0.3p/MB. Outside Europe, there’s a fair usage policy of 12GB/month. Your data usage will then be blocked for the remainder of the month.

Keeping Your Phone Number

If you’re joining one of Three’s unlimited data plans, it’s a straightforward process to keep your current phone number.

Start by asking your current mobile network to provide you with a PAC Code. This can be obtained by texting PAC to 65075, or by requesting it online through your mobile network’s website or app. You can then order your new phone or SIM card from the Three website.

When your new phone or SIM card arrives from Three, fill out this form on their website. After submitting your PAC Code through this form, Three will schedule the transfer of your phone number (normally for the next working day). In the meantime, you’ll continue to receive a service from your old network.

For step-by-step instructions on transferring your phone number to Three, please select your current mobile network from the drop-down menu below:

PAC Code Finder: Transfer Your Phone Number to Three

Select your current mobile network:

  More Options

For more information, see our full guide to transferring your phone number between networks.

Frequently Asked Questions

How much do unlimited data plans cost on Three?
You can get an unlimited data plan on Three for just £16 per month. This includes access to 5G at no extra cost, roaming in 71 destinations and unlimited personal hotspot usage. It’s also possible to get unlimited data on a Pay Monthly phone, home broadband, mobile broadband or Pay As You Go.
Is there a fair usage limit for unlimited data on Three?
No. There are no fair usage limits for unlimited data in the UK. The only requirement is that you use it for your own personal usage and not for commercial, resale or fraudulent purposes.

If you’re travelling abroad to other countries, a 20GB per month fair usage limit applies in European countries. A 12GB fair usage limit applies outside Europe.

What download speeds will I get?
You’ll have access to 5G at no extra cost on Three’s unlimited data plans. This gives you average download speeds of around 200Mbps, so long as you’re within a 5G coverage area. Peak download speeds of up to 1,000Mbps are available on Three.

On Three’s 4G network, you’ll normally be able to access speeds of around 20-30Mbps. In some cases, this can go up to a maximum of 300Mbps.

Can I use tethering or personal hotspot on Three’s unlimited data plans?
Yes. You can use tethering or personal hotspot to share your unlimited data allowance with other devices. There’s no limit on how much data you’re able to share and how many devices you’re able to connect at the same time.
What coverage will I get on Three?
Three offers the following coverage in the UK:
  • 5G Coverage: 194 UK towns and cities
  • 4G Coverage: 99.8% population coverage
  • 3G Coverage: 98.7% population coverage
Can I use unlimited data when travelling abroad?
You can use up to 20GB of data abroad in other European countries. Outside Europe, you can use up to 12GB of data in Go Roam Around The World countries.
Is it possible to keep an existing phone number?
Yes. You can keep your existing phone number when moving to Three. Just ask your current mobile network to provide you with a PAC Code. You can get one through their website or app, or by texting PAC to 65075. You’ll need to give this PAC Code to Three after you sign up.

More Information

For more information about unlimited data on Three, please see the official Three website.

You can also read our overviews of unlimited data in the UK and 5G unlimited data plans.

Your Comments 134 so far

We'd love to hear your thoughts and any questions you may have. So far, we've received 134 comments from readers. You can add your own comment here.

  • graham dale said:

    i just have the 3 router/dongle but keep running out of data is there a unlimited data deal for me to upgrade to?

  • After being with Tesco for 6 years, I thought long and decided to go with three. This was January this year.
    In the beginning first 4-5 weeks everything seemed fine with my all you can eat data, but now I am certain it is throttled. I’m using my phone as hotspot, and right now, as I type, I’m struggling to download the three app.
    The speed is reading 0.53mbps with a ping of 480ms..shambles.
    I’ve been trying to download the three app for the past hour, as stupidly, it’s the only way you can contact three…due to coronavirus they say.
    But they haven’t stopped or reduced the monthly charge they take out of my account.
    Terrible absolutely terrible

  • If you value your mental health, don’t get involved with this bunch of i#*ots and bandits.
    I’ve been with them for 3 years, and only issues, 6 or 7 times of which they’ve had to refund me 2or 3months at a time for absolutely disgraceful and useless service.
    What do I include in service? Well…complete loss or 1 bar of signal(totally dysfunctional ) and both calls and data of no use. I’ll mention here I’ve been on all you can eat everything for 3 year.
    Do not go with 3. You have been warned!!

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