Explore Mobile Phones

Unlimited data SIM deals

× Filters Reset

Filters

Monthly cost (£)
0
50
Data (GB)
0
Unltd
Minutes
0
Unltd
Texts
0
Unltd
Contract length
Providers
Show all
More filter options
Unltd
texts
Unltd
minutes
50GB
of 5G data
1
month contract
£15.00
per month
  • Includes data rollover
  • EU Roaming
  • Free delivery
  • 30 day returns policy
Unltd
texts
Unltd
minutes
Unltd
5G data
12
month contract
£28.00
per month
  • Includes capping + data rollover
  • Free delivery
  • 14 day returns policy
Unltd
texts
+ £50 cashback at
Unltd
minutes
+ £50 cashback at
100GB
of 5G data
12
month contract
£20.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
50GB
of 4G data
12
month contract
£15.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
120GB
of 5G data
24
month contract
£20.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
60GB
of 5G data
12
month contract
£25.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
+ £45 cashback at
Unltd
minutes
+ £45 cashback at
Unltd
5G data
12
month contract
£20.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
Unltd
5G data
1
month contract
£20.00
per month
  • EU Roaming
  • Free delivery
  • 30 day returns policy
Unltd
texts
Unltd
minutes
Unltd
4G data
1
month contract
£15.00
per month
  • £10 off for 3 months
  • 100 international minutes to over 40 countries
  • Free delivery
  • 14 day returns policy
Exclusive
Unltd
texts
Unltd
minutes
50GB
of 5G data
12
month contract
£12.00
per month
  • Includes data rollover
  • EU Roaming
  • Free delivery
  • 30 day returns policy
Unltd
texts
+ £40 cashback at
Unltd
minutes
+ £40 cashback at
60GB
of 5G data
12
month contract
£16.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
50GB
of 5G data
12
month contract
£13.00
per month
  • Includes data rollover
  • EU Roaming
  • Free delivery
  • 30 day returns policy
Unltd
texts
+ £15 cashback at
Unltd
minutes
+ £15 cashback at
100GB
of 4G data
12
month contract
£15.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
+ £40 cashback at
Unltd
minutes
+ £40 cashback at
60GB
of 5G data
18
month contract
£16.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
+ £30 cashback at
Unltd
minutes
+ £30 cashback at
60GB
of 5G data
18
month contract
£16.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
+ £5 cashback at
Unltd
minutes
+ £5 cashback at
100GB
of 5G data
12
month contract
£15.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
100GB
of 5G data
12
month contract
£15.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
50GB
of 4G data
1
month contract
£15.00
per month
  • Unrestricted tethering in the UK
  • No speed caps
  • Free delivery
Unltd
texts
+ £50 cashback at
Unltd
minutes
+ £50 cashback at
100GB
of 5G data
18
month contract
£18.00
per month
  • Free delivery
  • 14 day returns policy

Unlimited data SIM deals

MoneySuperMarket logo

Here’s everything you need to know about unlimited data SIM deals, including how much they cost and how to get the best deal

Compare deals

If you stream Netflix shows on the go, download music on your phone, use social media apps or play games online, an unlimited data SIM is well worth a look.

Indeed, unlimited data SIMs mean you can you use the internet as much as you want, whenever you want, without incurring any surprise charges.

Read on to find out more…

Our best unlimited data SIM deals this week

You’ll find our best unlimited data SIM deals below, all of which have been handpicked by our experts.

  • SMARTY sim only
    4G
    • 30GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • Unrestricted tethering in the UK
    • £10.00 per month
    1 month contract From SMARTY
  • ID sim only
    5G
    • 50GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • Includes data rollover
    • £15.00 per month
    1 month contract From iD Mobile
  • Lebara Mobile sim only
    4G
    • Unlimited 4G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £10 off for 3 months
    • £15.00 per month
    1 month contract From Lebara Mobile

What is an unlimited data SIM?

In a nutshell, unlimited data SIMs give you unfettered access to the internet – you’ll never run out of data, and you won’t be subject to any nasty charges at the end of the month, either.

Generally, they’re more expensive than standard SIMs. But that extra outlay means you’ll always have access to data when you need it. So you can watch as many episodes of your favourite show as you want, and stream music to your heart’s content on long commutes.

How do unlimited data SIMs work?

Unlimited SIMs work in the same way as normal SIM cards. Once you’ve signed up, simply pop the SIM card into your phone to get started.

In terms of usage restrictions, this is where things can get a bit tricky. You see, some networks apply what are known as fair usage policies on their ‘unlimited’ plans. This means that in practice they enforce usage limits of between 650GB and 1,000GB per month.

Now, the chances of exceeding those limits, even for heavy users, are extremely low – according to Ofcom, the average person only gets through about 3GB of data a month – but it’s still worth being aware of these limitations before you pick a network to go with.

Which networks offer unlimited data SIMs?

You’ll find unlimited data SIM plans from most of the UK’s major networks, including:

Vodafone

  • Vodafone sim only
    4G
    • 100GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £20.00 per month
    12 month contract From Vodafone
  • Vodafone sim only
    4G
    • 100GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £20.00 per month
    12 month contract From Vodafone

Depending on which plan you choose, you’ll be able to use your Vodafone unlimited data SIM in up to 81 destinations (25GB data cap applies) for no extra charge.

Unlimited 5G data plans are also available, and there are three different download speeds to choose from.

EE

  • EE sim only
    5G
    • 120GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £20.00 per month
    24 month contract From EE Mobile
  • EE sim only
    5G
    • 120GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £20.00 per month
    24 month contract From EE Mobile
  • EE sim only
    5G
    • 120GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £20.00 per month
    24 month contract From EE Mobile

EE’s unlimited data SIM plans come with perks like free Apple Music for six months, plus EU roaming and wide coverage across the UK. Plans are available on a 24-month contracts.

Tesco Mobile

Tesco Mobile offers competitively priced unlimited data plans. And because it uses O2’s network, you’ll also benefit from 99% 4G network coverage, plus widespread 5G coverage as it’s rolled out across the country.

O2

  • EE sim only
    5G
    • 120GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £20.00 per month
    24 month contract From EE Mobile
  • EE sim only
    5G
    • 120GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £20.00 per month
    24 month contract From EE Mobile
  • EE sim only
    5G
    • 120GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £20.00 per month
    24 month contract From EE Mobile

Unlimited data SIM deals with O2 start from around £30 per month and come with excellent perks like six months off Disney+ and Amazon. 5G data is included as standard, and there’s no speed restrictions either.

Smarty

  • SMARTY sim only
    4G
    • 30GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • Unrestricted tethering in the UK
    • £10.00 per month
    1 month contract From SMARTY
  • SMARTY sim only
    4G
    • 30GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • Unrestricted tethering in the UK
    • £10.00 per month
    1 month contract From SMARTY
  • SMARTY sim only
    4G
    • Unlimited 4G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • No speed caps
    • £16.00 per month
    1 month contract From SMARTY

Smarty’s Unlimited data plan comes on a one-month, rolling contract. It’s competitively priced, and offers unrestricted tethering and no credit checks to boot.

iD Mobile

iD Mobile uses Three’s mobile network, and offers an array of competitively priced SIM only deals, including unlimited data SIMs. Choose from a 12-month or 24-month contract.

Three

  • Three sim only
    5G
    • Unlimited 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £24.00 per month
    1 month contract From Three Mobile
  • Three sim only
    5G
    • Unlimited 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £24.00 per month
    1 month contract From Three Mobile
  • Three sim only
    5G
    • Unlimited 5G data
    • Unlimited minutes
    • Unlimited texts
    • download speed limit
    • £24.00 per month
    1 month contract From Three Mobile

Three’s unlimited data SIM plans are keenly priced, and come in the form of 12-month, or 30-day rolling contracts. Moreover, all plans are truly unlimited and 5G-ready.

giffgaff

With giffgaff ‘golden goodybag’ add-on, you’ll get unlimited 5G data, plus free roaming capped at 20GB per month.

What to look for in unlimited data SIMs?

When thinking about unlimited data SIM plans, you’re going to want to consider price, contract length, and look closely at what customer incentives the network has to offer.

More often than not, a plan which includes incentives like free access to streaming services will likely cost more in the long-run but is worth it if you plan on using your data to watch films and TV shows on the go.

Price

You’ll find some unlimited data SIM plans for as little as under £20 per month. With these rates, though, don’t expect eye-popping incentives or free roaming – as we say, those tariffs will cost more.

But if you’re not too bothered about six months free Apple Music or Amazon Prime, then absolutely go for one of these plans. You’ll find them from the likes of Tesco Mobile and giffgaff.

Contract length

There are a few different unlimited data SIM contract lengths available, from networks both large and small.

For example, some networks offer 12-month or even 24-month contracts, along with incentives to get you stay for as long as possible.

On the other hand, others cater for flexibility, and boast 30-day, rolling contracts so you have the option to cancel any time you want without incurring any charges.

To ensure you’re getting the best contract deal for you, think about how long you want to be tied to a particular contract.

If you don’t like the thought of sticking with one provider for a long period of time, consider providers like Smarty and iD Mobile, which both offer 30-day rolling contracts.

Unlimited social data

Only interested in unlimited data for social media and chat apps? VOXI’s unlimited data SIMS include endless social data, meaning unlimited data for sites like WhatsApp, Facebook and Twitter.

Elsewhere, if you’re already a Virgin Mobile customer, you’ll already get to use sites like WhatsApp and Facebook messenger as much as you want without incurring any charges.

Freebies

As we say, many networks will offer freebies like streaming services and vouchers and incentive for signing up to a contract.

But be wary – although these incentives are great if you intend to use them, the contract itself will likely be more expensive.

Pros and cons of unlimited data SIMs

Pros

  • Don’t have to worry about running out of data.
  • Stream music and watch TV services as much as you want.
  • No nasty charges at the end of the month.

Cons

  • More expensive than plans with usage limits.
  • Some networks apply tethering, usage and speed limits.
  • Only worth it if you’re a heavy mobile internet user.

Alternative SIM only plans

Unlimited data plans not for you? There are plenty of other SIM plans to choose from, including:

Frequently asked questions

Is there truly an unlimited data SIM plan?

Yes. Plenty of networks offer truly unlimited data plans, though some may also enforce usage limits in their ‘fair usage policy’ too. That said, these usage limits still offer more than enough data, even for heavy mobile internet users.

Check your network’s terms and conditions to be absolutely sure.

Can I use my unlimited data SIM abroad?

In most cases, yes. Though the majority of networks will set a limit as to the amount of data you can use abroad, and terms are often more stringent for counties outside of the EU.

Am I limited to how much data I can hotspot if I have unlimited data?

This really depends on your network. Some will restrict the amount of devices you can hotspot, while others will not. Check with your network to find out specific terms and conditions.

Can I get unlimited 5G data?

Absolutely. Following the 5G rollout across the UK, more networks are offering unlimited 5G data plans, and we expect plenty more to follow suit in 2021.

Can I get a mobile contract with unlimited data?

Sure. Most of the UK’s major networks offer unlimited data contracts, ranging from 12-months to 24-months. And if you’d prefer more flexibility over a length contract, 30-day rolling contracts are also available, though you may end up paying a little more overall.