Three has a number of hidden SIM-only deals, including 8GB data for £7, 25GB data for £8, and 120GB data for £12. Save money with their exclusive 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 with these hidden deals. For instance, you can get 25GB data for £8 (reduced from £14 per month). There’s also 120GB data for £12, and unlimited data for £18.

Alongside their ‘Standard SIMO’ plans, Three also offers hidden ‘Plus’ and ‘Premium’ SIM-only 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 Standard, Plus and Premium 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: 1 month, 12 month or 24 month contract
Hidden SIM Only Deals:
Inclusive Features:
  • Access to 5G at no extra cost, with the fastest available speeds.
  • Access to Three+ app with weekly discounts (e.g. Cineworld & Caffè Nero).
  • Inclusive Paramount+ & roaming on Plus and Premium SIMO plans.
Coverage:
  • 5G coverage in 300+ UK towns & cities (check your postcode)
  • 99.8% population coverage on 3G & 4G

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 £8 per month against the normal price.

  • If you’re a light mobile user, Three offers 3GB data for £5 and 8GB data for £7 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.
  • Our recommended plan for most users gives you 25GB data for £8. This is discounted from the normal price of £14 per month.
  • For heavy data users, there’s 120GB data for £12 or unlimited data for £18. This is reduced from the standard price of 120GB data for £16 and unlimited data for £24.

The following table shows the best SIM-only deals that are currently available from Three in the UK:

TariffMinutesTextsDataMonthly
Cost
StandardUnlimitedUnlimited3GB£5.00
12 months
StandardUnlimitedUnlimited8GB£7.00
12 months
StandardUnlimitedUnlimited25GB£8.00
12 months
StandardUnlimitedUnlimited120GB£12.00
12 months
StandardUnlimitedUnlimitedUnlimited£19.00
12 months

If you’re looking for an unlimited data plan, this is available for £18 per month when you sign up on a longer 24-month contract:

TariffMinutesTextsDataMonthly
Cost
StandardUnlimitedUnlimitedUnlimited£18.00
24 months

All of these deals are ‘Standard SIMO’ plans that will give you access to 5G coverage on Three’s network with no speed limits or restrictions. You’ll also get access to the Three+ app included at standard.

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

Standard, Plus & Premium SIMO Plans

If you’re looking for additional plan benefits, you can upgrade your ‘Standard SIMO’ plan to a ‘Plus SIMO’ plan or ‘Premium SIMO’ from Three.

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

Standard SIMO Plus SIMO Premium SIMO
Data Plans
3GB Data £5 per month £10 per month £15 per month
8GB Data £7 per month £12 per month £17 per month
25GB Data £8 per month £13 per month £18 per month
120GB Data £12 per month £17 per month £22 per month
Unlimited Data £18 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 ‘Plus 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 ‘Premium SIMO’ plan, you’ll 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 Standard SIMO plan is available from just £5 per month when you order through one of the links below:

TariffMinutesTextsDataMonthly
Cost
StandardUnlimitedUnlimited3GB£5.00
12 months
StandardUnlimitedUnlimited3GB£6.00
24 months
PlusUnlimitedUnlimited3GB£10.00
12 months
PremiumUnlimitedUnlimited3GB£15.00
12 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 £7 per month. This also includes unlimited UK minutes and unlimited UK texts.

TariffMinutesTextsDataMonthly
Cost
StandardUnlimitedUnlimited8GB£7.00
12 months
PlusUnlimitedUnlimited8GB£12.00
12 months
PremiumUnlimitedUnlimited8GB£17.00
12 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 only £8 per month, it offers a good balance between getting lots of data at an affordable price.

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

TariffMinutesTextsDataMonthly
Cost
StandardUnlimitedUnlimited25GB£8.00
12 months
PlusUnlimitedUnlimited25GB£13.00
12 months
PremiumUnlimitedUnlimited25GB£18.00
12 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 £12/month. This is more than enough data for the majority of mobile users, and is a cheaper alternative to Three’s unlimited data SIM card which starts from £18/month.

TariffMinutesTextsDataMonthly
Cost
StandardUnlimitedUnlimited120GB£12.00
12 months
PlusUnlimitedUnlimited120GB£17.00
24 months
PremiumUnlimitedUnlimited120GB£22.00
12 months

Unlimited Data

At present, Three offers an unlimited data SIM card for just £18/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
StandardUnlimitedUnlimitedUnlimited£18.00
24 months
StandardUnlimitedUnlimitedUnlimited£19.00
12 months
PlusUnlimitedUnlimitedUnlimited£23.00
24 months
PlusUnlimitedUnlimitedUnlimited£24.00
12 months
PremiumUnlimitedUnlimitedUnlimited£28.00
24 months
PremiumUnlimitedUnlimitedUnlimited£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.

  • Dave L said:

    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.

    • Ken replied:

      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

  • Paul said:

    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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