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Unlimited data SIM only deals

If you don’t want any restrictions on the amount of data you use with your mobile phone, an unlimited data SIM only deal is the way to go. Most UK networks now offer unlimited data deals to suit a range of budgets.

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Networks
Monthly cost
Data
5G
Minutes
Contract length
Texts
1
SMARTY logo
SMARTY SIM card

Contract length

No contract

Contract length

No contract

Minutes

Unlimited

Minutes

Unlimited

Texts

Unlimited

Texts

Unlimited

5G
EU roaming included
Unlimiteddata
£16.00per month
Asda Mobile logo
Asda Mobile SIM card

Contract length

1 month

Contract length

1 month

Minutes

Unlimited

Minutes

Unlimited

Texts

Unlimited

Texts

Unlimited

5G
EU roaming included
Up to 150 Mbps
Cyber Monday deal
Unlimiteddata
£20.00per month
Asda Mobile logo
Asda Mobile SIM card

Contract length

1 month

Contract length

1 month

Minutes

Unlimited

Minutes

Unlimited

Texts

Unlimited

Texts

Unlimited

5G
EU roaming included
Up to 2 Mbps
Cyber Monday deal
Unlimiteddata
£15.00per month
Three Mobile logo
Three Mobile SIM card

Contract length

12 months

Contract length

12 months

Minutes

Unlimited

Minutes

Unlimited

Texts

Unlimited

Texts

Unlimited

5G
Unlimiteddata
£17.00per month
Lebara Mobile logo
Lebara Mobile SIM card

Contract length

No contract

Contract length

No contract

Minutes

Unlimited

Minutes

Unlimited

Texts

Unlimited

Texts

Unlimited

5G
No annual price rise
£9.98 for first 4 months
Cyber Monday exclusive
Unlimiteddata
£24.95per month
iD Mobile logo
iD Mobile SIM card

Contract length

1 month

Contract length

1 month

Minutes

Unlimited

Minutes

Unlimited

Texts

Unlimited

Texts

Unlimited

5G
Wi-Fi-calling
3 months' Free Apple TV+
Cyber Monday deal
Unlimiteddata
£15.00per month
iD Mobile logo
iD Mobile SIM card

Contract length

12 months

Contract length

12 months

Minutes

Unlimited

Minutes

Unlimited

Texts

Unlimited

Texts

Unlimited

5G
Wi-Fi-calling
3 months' Free Apple TV+
Cyber Monday deal
Unlimiteddata
£16.00per month
Three Mobile logo
Three Mobile SIM card

Contract length

24 months

Contract length

24 months

Minutes

Unlimited

Minutes

Unlimited

Texts

Unlimited

Texts

Unlimited

5G
Unlimiteddata
£16.00per month
O2 logo
O2 SIM card

Contract length

12 months

Contract length

12 months

Minutes

Unlimited

Minutes

Unlimited

Texts

Unlimited

Texts

Unlimited

5G
EU roaming included
Unlimiteddata
£28.00per month
Vodafone logo
Vodafone SIM card

Contract length

12 months

Contract length

12 months

Minutes

Unlimited

Minutes

Unlimited

Texts

Unlimited

Texts

Unlimited

Unlimiteddata
£25.00per month
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Uswitch services are provided at no cost to you, but we may receive a commission from the companies we refer you to. To find out more about how our site works, click here. If a deal is ‘promoted’ on Uswitch’s tables, then it has been lent additional visibility as a result of us securing exclusivity on a great deal, or a commercial agreement to showcase what we believe to be market-leading value to consumers.

What is unlimited data?

As the name suggests, Unlimited data SIMs give you unlimited access to the internet on your mobile device. That means you’ll never run out of data to surf the web, browse social media and stream content. Unlimited data also means you’ll never have to deal with surprise charges in your bills.

Unlimited data deals generally cost more than deals that have a cap on the amount of data you get. But the upside is, there'll never be a moment when you have to worry about running out of data. You’ll be able to stream, upload, download, chat and message as much as you want.

Is there a data cap?

There’s no data cap on an unlimited data SIM only deal. You’re free to use as much mobile data as you like on your smartphone. There may be an instance where a fair usage policy is applied, but this will come down to individual networks. So check the fine print of your deal before you commit. But generally, unlimited means unlimited.

Is there a limit to the amount of data I can download?

Most unlimited data SIM only deals will not have any restrictions and you’ll be able to download as much data as you want. Some networks may include a fair usage policy. But even if that’s the case, it won’t kick in after you’ve used more than enough data for most consumers. Check with your network to see what their specific policy is.

How to get cheap unlimited data deals?

Unlimited data SIM only deals usually cost more than deals with a set amount of data. But you can still find a deal that suits your budget by comparing offers from all the major networks, such as Vodafone, EE, O2, Three, and more.

Why choose unlimited data plans?

If you get an unlimited data SIM only data plan, you’ll never have to worry about running out of data. That means you can stream, scroll, and share as much as you want, when you want. With unlimited data, you won’t have to wait till you’re on a Wi-Fi connection to make big downloads or share large files.

What are the benefits of unlimited data deals?

The main benefit of an unlimited data deal is never running out of mobile data. So, even if you’re miles away from a Wi-Fi connection, you won’t have to worry about using lots of data on streaming a show or running an online playlist all day. It’s the best way to ensure you always have data when you need it.

Alternatives to unlimited SIM only plans

If you don’t want to go for an unlimited data SIM only deal but still require a lot of data, you can simply opt for a plan that caps your limit at a high number, like 100-200GB. Most networks provide deals with extremely high data caps, so compare SIM only deals on Uswitch today to find a price plan that suits your needs.

Which providers offer unlimited data deals?

You can get an unlimited data SIM only deal on most major UK networks.

Here’s a quick look at some of the extras you can get:

Vodafone

Some Vodafone SIM only unlimited data deals allow you to use up to 25GB overseas in 81 countries at no extra cost.

You can also get unlimited 5G SIM only data plans at three different speed levels, similar to a broadband package.

Three

Three’s SIM only unlimited data deals are attractively priced and can be picked up on 30-day rolling or 12-month contracts. They’re all 5G-ready as standard too, with no caps or fair usage policy.

giffgaff

Choose giffgaff’s ‘golden goodybag’ add-on to get unlimited 5G data and free international roaming (although this has a 20GB per month cap limit).

Tesco Mobile

Tesco Mobile’s unlimited SIM only offerings are competitively priced. And since Tesco Mobile runs on O2’s network, you’ll enjoy 99% 4G coverage across the UK, as well as 5G coverage in a wide range of locations.

O2

O2’s unlimited data SIM only price plans begin at around £30 a month and can include exciting extras like discounts on Amazon Prime and Disney Plus. You’ll also enjoy 5G as standard with no speed restrictions.

And O2 is so far one of the only major UK networks that hasn’t reintroduced roaming charges in the EU. So you’ll be able to use your data, as well as your calls and texts, for no extra charge while you’re travelling to EU countries.

Smarty

Smarty offers an unlimited SIM only data plan on a monthly rolling contract. There are no tethering restrictions and you don’t need to pass a credit check.

Will I lose service if I switch to a SIM only deal with another network?

No, you won’t lose any service by switching networks to a new SIM only deal.

How easy is it to switch networks?

Switching networks on a SIM only deal is incredibly easy thanks to Text to Switch. All you need to do is text PAC to 65075 to receive your PAC code. You then give this to your new network who’ll be able to port over your current phone number. As long as you’re out of contract, you don’t even need to speak to your old network.

FAQs

Is unlimited data really unlimited?

Yes, in most cases unlimited means unlimited - so no data cap at all. Some networks may operate with a fair usage policy, so check before you sign up if that’s something you’re not sure of.

Does unlimited data mean unlimited hotspot?

Different networks will have different policies on using your unlimited data for hotspot, so check their terms and conditions before you commit to a plan.

If I have unlimited data do I need wifi?

No, with an unlimited data SIM only deal you’ll never need to log into wi-fi if you don’t want to. However, there may be occasions where a wi-fi connection is faster than mobile data so where you turn wi-fi on in some scenarios is up to you.

Can I use my unlimited data SIM abroad?

Different networks will have different policies on using your unlimited data abroad. Check up on your network’s roaming policy before you travel to be sure.

Can I get unlimited 5G data?

Yes, most networks now include 5G as standard with their SIM only deals, including on unlimited data plans.

What can I do with my old SIM?

If you have an old SIM card you no longer use, you can simply throw it away when you get your new unlimited data SIM.

Are unlimited data sims more expensive?

Yes, unlimited data SIM only deals will usually be more expensive than a deal that comes with a data cap. However, that doesn’t mean you can’t shop around to find a suitably priced deal for your budget.