Three offers unlimited data plans from £16 per month with 5G and truly unlimited downloads. See Three’s best unlimited data plans.

In the UK, Three now offers unlimited data from only £16 per month. This comes with 5G and truly unlimited data, with no hidden speed limits or limits on how much you can download.

As a special offer for customers signing up through this link, you can currently get unlimited data for only £16 per month on a 12-month plan. This is a saving of £6 per month against the normal price you’ll find on Three’s website.

Get Unlimited Data for £16 per month →

Three also offers unlimited data on a range of Pay Monthly phones, along with unlimited 4G home broadband and unlimited 5G home broadband.

In this article, we’ll review Three’s unlimited data plan. We’ll look at the features you’ll get included and how Three’s unlimited data plan compares to other networks. We’ll also look at the 4G & 5G coverage you can expect on Three and how you can keep your current phone number when switching to Three.

Prices From: £16 per month
Contract Length: 1 month, 12 month or 24 month contract
Inclusive Features:
  • Access to 5G at no extra cost & the fastest available speeds.
  • Access to Three+ app with weekly discounts (e.g. Uber Eats & Cineworld).
  • Share your unlimited data with other devices through tethering & hotspot.
Fair Usage: No fair usage limits or speed restrictions. Personal use only.
Exclusive Offer: Unlimited Data SIM card for £16/month
(12 month contract, normally £21/month)
Alternative Deal: £11/month for 6 months, then £22/month – plus a £100 reward card for switching
(24 month contract, average cost of £15.08/month taking the reward card into account)
Coverage:
  • 5G coverage in 300+ UK towns & cities (check your postcode)
  • 99.8% population coverage on 3G & 4G

Three Unlimited Data Plans

In the UK, Three now offers “truly unlimited data” from only £16 per month. Available exclusively to customers ordering through this link, the SIM card will give you unlimited UK minutes, unlimited UK texts and unlimited UK data for £16. You’ll also get 5G at no extra cost.

The £16 unlimited data deal is an exclusive offer that you won’t find directly on Three’s website. If you go directly to Three’s website, you’ll need to pay £22 per month for the same deal.

As a special offer for May 2022, Three is also offering a 24-month plan with 6 months half price. In addition, there’s a £100 reward card available for switching your phone number to Three. Taking this reward card into account, there’s an average monthly cost of just £15.08/month.

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

NetworkMinutesTextsDataMonthly
Cost
ThreeUnlimitedUnlimitedUnlimited£16.00
12 months
ThreeUnlimitedUnlimitedUnlimited£16.00
24 months
ThreeUnlimitedUnlimitedUnlimited£24.00
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.

Three also 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. For more information, see our Three broadband review. Alternatively, you can get unlimited 4G mobile broadband through the Huawei 4G Plus MiFi.

Download Speeds

In the UK, Three’s unlimited data SIM cards are all 5G-ready. There are no hidden speed limits or fair usage limits for unlimited data. This is confirmed on Three’s website:

All SIMs are 5G Ready at no extra cost.

Our Unlimited data plans are the best, because the data is truly Unlimited and you never need to worry about your next bill. There are no speed caps, no data caps, and no hidden limits when you’re using our Unlimited data in the UK.

If you’re connected to Three’s 5G network, you can expect an average download speed in excess of 200Mbps. In some cases, you may even be able to get peak download speeds of up to 1,000Mbps (1Gbps) when you’re connected to 5G. As Three’s 5G network uses 100MHz of contiguous spectrum, this allows them to offer faster download speeds than other UK networks.

If you’re using Three’s 4G network, you can expect an average download speed in the region of 20-30Mbps. This can vary substantially depending on your location, with peak download speeds of 300Mbps sometimes being available on 4G.

Fair Usage Policy

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

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 travelling abroad outside the UK, you’ll be able to use your UK allowances abroad for a fixed daily cost. It will cost you £2/day when you Go Roam in Europe and £5/day when you Go Roam Around The World. If you’re using the Go Roam offer, there’ll be a 12GB per month fair usage limit when you’re abroad. Beyond this, you’ll be surcharged at 0.3p/MB in Europe. Outside Europe, your international roaming may be suspended until the next billing period. 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 hidden fair usage limits.

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 to us in writing 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.

Comparison to Alternatives

Three currently offers their unlimited data SIM card for only £16 per month when you order through this link. It’s one of the UK’s best value unlimited data plans, especially when you consider the uncapped 5G speeds.

NetworkMinutesTextsDataMonthly
Cost
ThreeUnlimitedUnlimitedUnlimited£16.00
12 months

Get Unlimited Data for £16 →

If you’re looking for a shorter one-month rolling plan, Three also has a £24 one-month unlimited data SIM. However, this works out to be comparatively expensive. Instead, you can consider getting your unlimited data SIM card from SMARTY instead. SMARTY offer unlimited data with no contract and with 5G coverage from the Three network:

NetworkMinutesTextsDataMonthly
Cost
SmartyUnlimitedUnlimitedUnlimited£16.00
1 month
ThreeUnlimitedUnlimitedUnlimited£24.00
1 month

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:

NetworkMinutesTextsDataMonthly
Cost
SmartyUnlimitedUnlimitedUnlimited£16.00
1 month
ThreeUnlimitedUnlimitedUnlimited£16.00
12 months
Tesco MobileUnlimitedUnlimitedUnlimited£17.50
24 months
Superdrug MobileUnlimitedUnlimitedUnlimited£20.00
1 month
Lebara MobileUnlimitedUnlimitedUnlimited£22.50
12 months
VodafoneUnlimitedUnlimitedUnlimited
2Mbps max
£23.00
24 months
giffgaffUnlimitedUnlimitedAlways-On£25.00
1 month
VodafoneUnlimitedUnlimitedUnlimited
10Mbps max
£27.00
24 months
O2UnlimitedUnlimitedUnlimited£30.00
24 months
VodafoneUnlimitedUnlimitedUnlimited£32.00
24 months
VOXIUnlimitedUnlimitedUnlimited£35.00
1 month
EEUnlimitedUnlimitedUnlimited£35.00
24 months

For more information, see our full guide to unlimited data plans in the UK.

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. You’ll have access to uncapped download speeds on both 3G and 4G when you get an unlimited data plan from Three.

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 (three.co.uk) →

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

5G Coverage

Customers with a 5G-ready phone will also be able to access Three’s 5G network using an unlimited data SIM card. You can get an average download speed in excess of 200Mbps on Three’s 5G network, with peak speeds of up to 1Gbps (1,000Mbps).

Three’s 5G network is currently available in more than 300 UK towns and cities. You can check the availability of 5G where you live by entering your postcode on Three’s 5G coverage map:

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 several 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 30GB allowance was scrapped in 2019 as a result of net neutrality. You can now use as much data as you like for tethering and personal hotspot.

International Coverage

On Three’s unlimited data plans, you’re able to pay a fixed daily charge to use your UK allowances abroad in 71 destinations.

If you’re travelling to most European destinations, you’ll pay a fixed charge of £2/day from the 23rd May 2022. A fair usage limit of 12GB per month will apply, with further usage being surcharged at 0.3p/MB.

If you’re travelling to a Go Roam Around The World destination, you’ll pay a fixed daily charge of £5/day from the 23rd May 2022. This comes with a fair usage limit of 3000 minutes, 5000 texts and 12GB data per month. If you exceed these limits, you’ll need to wait until the following month for your roaming data allowance to refresh.

Keeping Your Phone Number

If you’re joining one of Three’s unlimited data plans, it’s a straightforward process keeping 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 submitting your PAC Code through the 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 unlimited data for just £16 per month on Three. This is an exclusive deal that saves you £5 per month against the normal price of £21 per month. You’ll also get it on a shorter 12-month plan.

Three’s unlimited data plan includes 5G at no extra cost, access to the Three+ app and unlimited personal hotspot usage. You can also get unlimited data on a Pay Monthly phone, home broadband, mobile broadband and 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 when abroad.

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

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 no limit on 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: 300+ 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 current phone number when you switch 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.

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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