Cookies on the SIM Sherpa website

We use cookies to track which pages on our website readers visit most. This helps us understand which topics people find interesting, to write more articles about them.

You can accept these tracking cookies or choose to block them. You can change these settings at any time.

X close

✖ Tracking cookies deleted and blocked

Ok, we will not track your page views as you move around any part of the SIM Sherpa website. But we will use that one cookie to remember you don't want to be tracked.

Click here to unblock tracking cookies

X close

✔ Cookies accepted

Thank you for accepting cookies for the SIM Sherpa website. This will help us constantly improve our content.

If you ever want to change your cookie settings for our website, go to our Cookies page here.

Three SIM only deals for May: how they compare on price

three logo with a SIM cardVisit

The retailers featured on this page may compensate us when our readers follow links to their websites and make a purchase. More

We've taken each of Three's best SIM only plans this month and compared them on price with other UK networks. Here's what we found. SIM Sherpa is your trusty guide. Last updated: 16th May 2022.

Three's best SIM only deals

The SIM only deal on Three we rate highest this month

Three SIM card
100GB data
a month

12-month dealGet this deal

(opens in new window)

We think Three's best value option on SIM only this May is their £12 a month plan below, which comes with 100GB data, plus unlimited minutes and texts on a 12‑month deal:

It's a good enough deal to get into Three's best SIMs but you can actually get a lower price for a similar plan elsewhere, even if you definitely want it to use the Three network. Here's where you can beat it on other networks:

Three's 30GB for £9 plan is a good option too

Three SIM card
30GB data
a month

12-month dealGet this deal

(opens in new window)

If you wouldn't get through that much data, we think this 30GB is one of the best SIM only plans on Three too. It's on a 12‑month deal, comes with unlimited minutes and texts - all for £9 a month:

It might not be the lowest-cost SIM only deal with 30GB data or more on the entire market but if you're sure you need a SIM using the Three network, it is the best-priced. See lower-priced networks' deals here:

Their £16 for unlimited data plan is a decent deal for May

Three SIM card
Unlimited data
a month

12-month dealGet this deal

(opens in new window)

To get an even bigger data allowance, we also think this £16 Three SIM is one of their best options. It comes with unlimited data, unlimited minutes and texts on a 12‑month deal:

It does enough to get into our pick of Three's best SIMs but that doesn't mean it's unbeatable on price. Other providers (even ones that use the Three network) can beat it. Here are other networks you can beat it on:

They're also offering 2GB for £5 on SIM only currently

Three SIM card
2GB data
a month

12-month dealGet this deal

(opens in new window)

If you don't need that much data, Three's £5 SIM below is another of their best deals this month. For £5 a month, it offers 2GB data, 200 minutes and unlimited texts on a 12‑month plan:

Compared to Three's other deals, this comes out among the best. But it's worth knowing you can get a lower price elsewhere, even on other providers that use the Three network. See the networks with cheaper plans here:

Compare all SIM only plans

Compare deals from all networks

How Three's deals compare with other networks

SIM card with magnifying glass



Three logo
ASDA logo
BT Mobile logo
EE logo
giffgaff logo
Honest logo
ID logo
IQ logo
Lebara logo
O2 logo
Plusnet logo
Sky logo
Talkmobile logo
Tesco logo
Virgin Mobile logo
Vodafone logo
VOXI logo


Data: (0MB+)

Minutes: (0+)


Maximum length: (Any)

Added features

More about Three's SIM only plans

How Three's SIM only prices and benefits compare

Ratings stars with the Three logo

We review Three's network in fullRead our full review

(opens in new window)

We said in our full review of the Three network that our favourite thing about them is their fast 4G and 5G speeds as well as their encouraging 5G coverage.

On SIM only you can take a 1-month, 12-month or 24-month contract. Typically the longer the contract, the lower your monthly cost. But it’s always worth shopping around to find their best current deal.

In terms of price, they’re the cheapest of the main networks (EE, Vodafone, O2, Three) and are fairly cheap compared to all providers. Their best deals tend to be their hidden deals on 12-month contracts.

Nowadays, Three are fairly low frills for a main network. They don’t offer much extra outside of their new Three+ rewards app and there are a few discounts on additional plans added to your account.

Useful link: Read our full Three review

Useful information about Three’s SIM only deals

Three network map screenshot

Test all the places you'll goCheck your signal

(opens in new window)

Three will send your SIM card within 3-5 working days. You’ll receive a package with every size of SIM in it, so you can fit your SIM into every phone. Three also offer eSIMs (see more info here).

Once your SIM arrives you’ll have 14 days to return it and get a full refund if you’re unhappy with it. There are some finickity rules about returning things bought in-store, so have a read of their terms and conditions for more information.

You’ll have to pass a credit check to get on a pay monthly SIM only plan with Three. If you’ve failed a credit check with Three you can take a monthly bundle or top up your SIM with credit and pay as you go.

If you want to keep your number when switching to Three from another network, you can do so by requesting a PAC from your old provider and giving it to Three at any time. Here’s their guide on how to do this.

Useful link: Compare all Three SIMs

Other Three guides