Three offers unlimited data plans with 5G. Deals include an unlimited data SIM at £16 per month for 12 months.

In the UK, Three offers unlimited data plans with 5G at no extra cost. You can get an unlimited data SIM card from £16 per month on a 12-month contract with no hidden limits on the download speed or how much you can download. You’ll also be able to roam at no extra cost in 71 worldwide destinations.

As a special offer for customers signing up through this link, you can get unlimited data for just £16 per month. This is a saving of £5 per month against the normal price on Three’s website.

Get Unlimited Data for £16 per month →

Three also offers a range of Pay Monthly phones along with 4G home broadband 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 on 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 moving to 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: £10.50/month for 6 months, then £21/month
(24 month contract, with an average cost of £18.38/month)

Three Unlimited Data Plans

In the UK, Three now offers a “truly unlimited data” SIM card for £16 per month. Available exclusively to customers ordering through this link, the SIM card gives you unlimited minutes, unlimited texts and unlimited data. You’ll also get 5G at no extra cost along with inclusive roaming in 71 worldwide destinations.

The £16 per month unlimited data deal is an exclusive offer that you won’t find directly on Three’s website. If you were to go directly to Three’s website, you’ll need to pay £20 per month for the same deal. Alternatively, Three also offers a 24-month plan with 6 months half price, giving an average monthly cost of £18.38/month.

The following table shows Three’s unlimited data SIM cards:

12 months
6 months half price
24 months
1 month

See all Unlimited Data Offers →

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

Alongside their unlimited data plans for mobile, Three offers unlimited 4G home broadband and unlimited 5G home broadband. Both of these will give you unlimited data for use on all of your devices at home, without the need to get a landline installed. For more information, read our Three broadband review. They also offer 4G mobile broadband on the Huawei 4G Plus MiFi hotspot.

Download Speeds

In the UK, all of Three’s unlimited data SIM cards are 5G ready and do not have any speed limits or fair usage policies. 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 an average download speed of about 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 other networks.

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

Fair Usage Policy

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

Prior to September 2019, Three had a 1,000GB per month threshold that was used to identify non-permitted commercial usage of their service. Three has confirmed that this 1,000GB per month threshold is no longer in place, with all of their unlimited data customers now having no data cap on their plan.

If you’re travelling abroad outside the UK, a fair usage policy applies to your data use abroad. As part of the Go Roam offer, you can use up to 12GB of data abroad at no extra cost each month. If you go over the 12GB monthly data roaming limit, you’ll pay a surcharge of 0.3p/MB in European countries. Outside Europe, additional roaming data isn’t available so you’ll need to wait until the start of your next billing period. Data speeds may be slower when you travel abroad unless you buy 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 are no hidden 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’ll get access to 5G coverage on it.

12 months

Get Unlimited Data for £16 →

If you’re looking for a shorter one-month rolling plan, Three has a £24 unlimited data SIM. However, this works out to be a comparatively expensive option. Instead, you should consider getting an unlimited data plan from either SMARTY or Superdrug. They both offer unlimited data at a lower monthly price and make use of 4G coverage from Three.

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 for the service. This essentially makes your first month free. In addition, there’s no credit check required on both SMARTY and Superdrug. You can also cancel your plan at any time without incurring any penalties.

Other Mobile Networks

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

1 month
12 months
iD MobileUnlimitedUnlimitedUnlimited£16.00
24 months
Superdrug MobileUnlimitedUnlimitedUnlimited£20.00
1 month
2Mbps max
24 months
Lebara MobileUnlimitedUnlimitedUnlimited£22.50
12 months
1 month
Tesco MobileUnlimitedUnlimitedUnlimited£25.00
24 months
24 months
10Mbps max
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 to 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 you join 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 to Three’s mobile network coverage.

5G Coverage

Customers with a 5G-ready device will also be able to access Three’s 5G network using 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 (January 2022)
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 of sharing your unlimited data allowance with other tethered devices.

On Three, there’s no limit on how much data you can share through tethering or personal hotspot. In addition, there’s no limit on how many devices you can connect at the same time. This differs from some other networks like EE and O2 (both of which impose a limit on tethering to a maximum of 12 devices).

Prior to October 2018, Three had a separate 30GB data allowance for tethering on their plans. This separate allowance was scrapped 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 use limit of 12GB per month applies when you’re using Go Roam Around The World. Further usage is surcharged at 0.3p/MB in Europe. Meanwhile, customers travelling outside Europe will need to wait for their roaming allowance to refresh the following 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. You can get one by texting PAC to 65075, or requesting it online through your mobile network’s website or app. You can then order your new phone or SIM card from Three’s website.

When your new phone or SIM card arrives from Three, fill out this form on their website. After you submit 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 provider.

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?
At present, you can get an unlimited data plan for just £16 per month on Three. This is an exclusive deal that saves you money against the normal price of £20/month on Three’s website. It’s also available on a shorter 12-month contract.

Three’s unlimited data plan includes 5G at no extra cost, roaming in 71 destinations and unlimited personal hotspot usage. You can also 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 inside 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 another country and using the Go Roam offer, a 12GB per month fair usage limit will apply.

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 inside Three’s 5G coverage area. You can access peak download speeds of up to 1,000Mbps on Three.

On Three’s 4G network, you’ll normally be able to access download 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 through tethering 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 keep my current 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 Three’s official website.

You may also find it useful to read our overview of unlimited data plans 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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