Three has a number of hidden SIM-only deals, including 8GB for £6, 25GB for £7, and 120GB data for £10. Save money with their exclusive SIMO deals.

In the UK, Three offers hidden SIM-only deals that you won’t be able to find if you go directly to their website. You can save a substantial amount of money with these hidden deals. For instance, you can get 25GB data for £7 (reduced from £10 per month). There’s also 120GB data for £10, and unlimited data for £20.

Alongside their ‘Lite SIMO’ plans, Three also offers ‘Value SIMO’ and ‘Complete SIMO’ plans. On these plans, you’ll get inclusive roaming, along with a subscription to Paramount+ service.

In this article, we’ll look at Three’s best SIM-only deals, including all of the hidden plans that can save you money. We’ll also compare the Lite, Value and Complete SIM-only plans from Three, including the benefits on each one. We’ll also look at how you can transfer your existing phone number to Three.

Prices From: £5 per month
Contract Length: 12 month or 24 month contract
Hidden SIM Only Deals:
Inclusive Features:
  • 5G at no extra cost, with the fastest available speeds.
  • Three+ app with weekly discounts (e.g. Cineworld & Caffè Nero).
  • Value & Complete SIMO plans come with roaming & Paramount+.
Coverage:

Best Three SIM Only Deals

In the UK, Three offers a number of hidden SIM-only deals. You’ll need to follow special links to their website to find these hidden deals, which can save you up to £7 per month against the normal price.

  • If you’re a light mobile user, Three offers 3GB data for £5 and 8GB data for £6. On both of these plans, you’ll get more data and for a lower monthly price than if you were to go directly to Three’s website.
  • For most users, our recommended plan gives you 25GB data for £7. This is heavily discounted from the normal price of £10 per month.
  • For heavy data users, there’s 120GB data for £10 and unlimited data for £20. This is reduced from the standard price of 250GB data for £15 and unlimited data for £20.

The following table shows the best 12-month SIM-only deals from Three:

TariffMinutesTextsDataMonthly
Cost
LiteUnlimitedUnlimited3GB£5.00
12 months
LiteUnlimitedUnlimited8GB£6.00
12 months
LiteUnlimitedUnlimited25GB£7.00
12 months
LiteUnlimitedUnlimited120GB£10.00
12 months
LiteUnlimitedUnlimitedUnlimited£21.00
12 months

If you’re looking for a larger data plan (with 120GB data or more each month), you can save even more when you sign up on a longer 24-month plan:

TariffMinutesTextsDataMonthly
Cost
LiteUnlimitedUnlimited120GB£10.00
24 months
LiteUnlimitedUnlimited250GB£15.00
24 months
LiteUnlimitedUnlimitedUnlimited£20.00
24 months
LiteUnlimitedUnlimitedUnlimited£20.00
24 months

All of these deals are Lite SIMO plans (previously known as ‘Standard SIMO’ plans). They’ll give you access to Three’s 5G network with no speed limits or restrictions. You’ll also get access to the Three+ app included as standard.

For additional benefits like inclusive roaming and Paramount+, you can choose a ‘Value SIMO’ or ‘Complete SIMO’ plan instead (see below).

Lite, Value & Complete SIMO Plans

If you’re looking for additional plan benefits, you can upgrade your ‘Lite SIMO’ plan to a ‘Value SIMO’ plan or a ‘Complete SIMO’ plan from Three.

The following table shows a side-by-side comparison of the three types of plan:

Lite SIMO Value SIMO Complete SIMO
Data Plans
3GB Data £5 per month £10 per month £15 per month
8GB Data £6 per month £12 per month £17 per month
25GB Data £7 per month £13 per month £18 per month
120GB Data £10 per month £17 per month £22 per month
250GB Data £15 per month £25 per month £30 per month
Unlimited Data £20 per month £23 per month £28 per month
Inclusive Allowances
Minutes & Texts
Unlimited Unlimited Unlimited
Personal Hotspot
Speed 5G with no speed limits 5G with no speed limits 5G with no speed limits
Additional Plan Features
Three+ Offers
Yes Yes Yes
Paramount+ No First half of plan Entire plan
Inclusive Roaming Chargeable 14 days per year 28 days per year

To upgrade to a ‘Value SIMO’ plan, you’ll normally pay about £5 per month more. This gives you inclusive Paramount+ for the first half of your contract (e.g. you’ll get 6 months of inclusive Paramount+ on a 12 month plan). You’ll also get 14 daily Go Roam passes each year, saving you up to £5 per day when you travel abroad.

To upgrade to a ‘Complete SIMO’ plan, you’ll normally pay about £10 per month more. This gives you inclusive Paramount+ for the entire length of your contract (worth £6.99 per month), plus 28 daily Go Roam passes each year (worth up to £5 per day).

SIM Only Deals: By Data Allowance

3GB Data

If you’re a light mobile user, Three’s entry-level 3GB Lite SIMO plan is available from just £5 per month when you order through one of the links below:

TariffMinutesTextsDataMonthly
Cost
LiteUnlimitedUnlimited3GB£5.00
12 months
LiteUnlimitedUnlimited3GB£5.00
24 months
ValueUnlimitedUnlimited3GB£10.00
12 months
ValueUnlimitedUnlimited3GB£10.00
24 months
CompleteUnlimitedUnlimited3GB£15.00
12 months
CompleteUnlimitedUnlimited3GB£15.00
24 months

A 3GB data plan could be suitable for you if you mainly use a wi-fi connection at home and at work. With your 3GB data allowance, you’ll be able to browse the web for around one hour per day. Alternatively, you can watch about 6 hours of online video each month in standard-definition (SD) quality on this plan.

8GB Data

Three’s 8GB data plan is a good choice if you’re looking for a little more data, but if you still use less data than the average UK mobile user.

Three currently offers a hidden 8GB SIM-only deal that costs just £6 per month. This also includes unlimited UK minutes and unlimited UK texts.

TariffMinutesTextsDataMonthly
Cost
LiteUnlimitedUnlimited8GB£6.00
12 months
LiteUnlimitedUnlimited8GB£6.00
24 months
ValueUnlimitedUnlimited8GB£12.00
12 months
ValueUnlimitedUnlimited8GB£12.00
24 months
CompleteUnlimitedUnlimited8GB£17.00
12 months
CompleteUnlimitedUnlimited8GB£17.00
24 months

An 8GB data plan should allow you to browse the web for around 3 hours per day or to watch about 30 minutes of standard-definition video each day. However, things like HD-quality video streaming can use up your data very quickly (e.g. just 4 hours of HD video will use up 8GB of data) so are best avoided on this plan.

25GB Data

For the average mobile user, we’d recommend Three’s 25GB per month data plan. Starting from just £7 per month, this gives you lots of data at an affordable price.

The following table shows Three’s latest 25GB per month deals:

TariffMinutesTextsDataMonthly
Cost
LiteUnlimitedUnlimited25GB£7.00
12 months
LiteUnlimitedUnlimited25GB£7.00
24 months
ValueUnlimitedUnlimited25GB£13.00
12 months
ValueUnlimitedUnlimited25GB£13.00
£10.40 for 12 months
24 months
CompleteUnlimitedUnlimited25GB£18.00
12 months
CompleteUnlimitedUnlimited25GB£18.00
£14.40 for 12 months
24 months

A 25GB data plan will allow you to browse the web for about 300 hours per month (up to 10 hours per day). Alternatively, you can stream about 5,000 songs or you can watch 50 hours of standard-definition video online.

120GB Data

If you’re a heavy mobile user, Three offers 120GB data for £10/month. This is more than enough data for the majority of mobile users, and is a cheaper alternative to the 250GB and unlimited data plans.

TariffMinutesTextsDataMonthly
Cost
LiteUnlimitedUnlimited120GB£10.00
12 months
LiteUnlimitedUnlimited120GB£10.00
24 months
ValueUnlimitedUnlimited120GB£17.00
12 months
ValueUnlimitedUnlimited120GB£17.00
£13.60 for 12 months
24 months
CompleteUnlimitedUnlimited120GB£22.00
12 months
CompleteUnlimitedUnlimited120GB£22.00
£17.60 for 12 months
24 months

250GB Data

If you’re looking for a plan with lots of data, Three is currently offering 250GB data for £15/month. This is a cheaper alternative to their unlimited data SIM card which starts from £20/month.

TariffMinutesTextsDataMonthly
Cost
LiteUnlimitedUnlimited120GB£10.00
12 months
LiteUnlimitedUnlimited120GB£10.00
24 months
ValueUnlimitedUnlimited120GB£17.00
12 months
ValueUnlimitedUnlimited120GB£17.00
£13.60 for 12 months
24 months
CompleteUnlimitedUnlimited120GB£22.00
12 months
CompleteUnlimitedUnlimited120GB£22.00
£17.60 for 12 months
24 months

Unlimited Data

At present, Three offers an unlimited data SIM card for just £20/month. This is a hidden deal which is only available when you purchase through this link.

The following table shows Three’s best unlimited data deals:

TariffMinutesTextsDataMonthly
Cost
LiteUnlimitedUnlimitedUnlimited£20.00
24 months
LiteUnlimitedUnlimitedUnlimited£21.00
12 months
ValueUnlimitedUnlimitedUnlimited£23.00
£18.40 for 12 months
24 months
ValueUnlimitedUnlimitedUnlimited£24.00
12 months
CompleteUnlimitedUnlimitedUnlimited£28.00
£22.40 for 12 months
24 months
CompleteUnlimitedUnlimitedUnlimited£29.00
12 months

All of Three’s unlimited data plans include 5G at no extra cost, with no hidden fair use limits or restrictions on how much you can download. You’ll also get the fastest available download speeds on Three’s network.

Tethering and personal hotspot are also included on all plans, allowing you to share your unlimited data allowance with other devices.

Keeping Your Phone Number

If you’re switching to Three, it’s a straightforward process keeping your current phone number.

Start by asking your current mobile network to give you a PAC Code. You can get one by texting PAC to 65075, or you can request one online through your mobile network’s website or app.

Once you’ve gotten your PAC Code, you’ll be able to place your order online with Three. You can provide them with the PAC Code when you sign up, or wait until the SIM card arrives and then fill out this form on their website.

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.

More Information

To get one of Three’s hidden SIM-only deals, tap on the relevant plan in the comparison tables above. You’ll then be taken to the Three website where you can place your order online.

Your Comments 6 so far

We'd love to hear your thoughts and any questions you may have. So far, we've received 6 comments from readers. You can add your own comment here.

  • Nazar Hussain said:

    Today (28/01/2023) Three is advertising unlimited for £12 per month, yesterday I renewed my 24m contract for £16 per month. I asked for PAC code first and after half hour of arguing and rejecting all other deals offered, I was given the £16 deal which I have been on for about 4 years now.

  • The table near the top, above the contents is missing the 4GB data for £6 and 100GB for £15. Perhaps these were omitted intentionally.

    What about upgrading if one finds the allowance isn’t enough? When on one of the hidden plans, is it possible to upgrade to the next hidden one up?

    For example, suppose one subscribes to the 2GB of data £5 and finds it isn’t enough; is it possible to move to the 4GB for £6?

    I may ask a similar question of other operators. Perhaps this is a subject to discuss on a page of its own, analysing the policies of each provider.

    • Hi Dave,
      Thanks for bringing this to my attention – this has now been fixed! 🙂
      With regards to upgrades, I don’t believe these will be available when you upgrade. If you want to increase your data allowance, you can do this through the My3 app but I believe they’ll only show you their normal plans there.
      Ken

  • Ken
    Are there any 3 offers available on PAYG bundles please ? I have already got a 3 PAYG SIM with some credit thereon.
    Thanks.
    Paul

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