Best data only SIM deals

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EXCLUSIVE
Unltd
texts
Unltd
minutes
4GB
of 4G data
1
month contract
£3.00
per month
  • First 3 months half price
  • Unrestricted tethering in the UK
  • Free delivery
EXCLUSIVE
Unltd
texts
Unltd
minutes
8GB
of 4G data
1
month contract
£3.50
per month
  • First 3 months half price
  • Unrestricted tethering in the UK
  • Free delivery
EXCLUSIVE
Unltd
texts
250
minutes
1GB
of 5G data
1
month contract
£3.99
per month
  • £0.99 for the first month
  • 50 international minutes to over 40 countries
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
3GB
of 4G data
1
month contract
£4.95
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
3GB
of 4G data
1
month contract
£4.95
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
2GB
of 4G data
1
month contract
£4.95
per month
  • Free delivery
  • 14 day returns policy
EXCLUSIVE
Unltd
texts
Unltd
minutes
3GB
of 5G data
1
month contract
£4.99
per month
  • £1.99 for the first month
  • 50 international minutes to over 40 countries
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
3GB
of 4G data
1
month contract
£5.00
per month
  • Unrestricted tethering in the UK
  • No speed caps
  • Free delivery
Unltd
texts
Unltd
minutes
1GB
of 4G data
1
month contract
£5.00
per month
  • Free delivery
  • 14 day returns policy
Unltd
texts
Unltd
minutes
1GB
of 4G data
1
month contract
£5.00
per month
  • Free delivery
  • 14 day returns policy

Data only sim cards: All you need to know

Data only SIMs icon

A data-only SIM will get you online when you're on the go. You can use them in devices that can connect to the internet but can't make calls - like tablets, dongles, and mobile Wi-Fi gadgets.

Compare deals

To find a data-only SIM deal that works for you, use our special SIM comparison table. You can get comparing right away - or read on to find out how to pick the best one for your device.

Top data only SIM deals this week

Provider Data Amount Contract Length Monthly Costs
O2 sim only 5GB data 1 month £16.00
  • O2 sim only
    5G
    • 5GB of 5G data
    • 0 minutes
    • 100 texts
    • download speed limit
    • Special offers with O2 Priority
    • £16.00 per month
    1 month contract From O2

What is a data-only SIM?

As the name suggests, a data-only SIM gets you an allowance of mobile Wifi usage for a monthly charge but doesn't include calls or texts.

They're principally intended for tablets, laptops, dongles and MiFi units. To that end, with data-only deals, you don’t pay for the phone – just the SIM card itself.

Yes, you can use a data-only with your tablet or laptop. Simply insert the SIM into your device’s SIM tray and you’re good to go.

That said, for laptops and old models made before 2010 may not have a SIM slot. In which case, you'll require a dongle or MiFi unit to get online.

How do I find the best data-only SIM deal?

CompareMyMobile is here to help you find the best deal. Check out all the SIM deals we've got from a bunch of UK networks on our comparison tool right here:

Enter all the criteria for what you need from your SIM, and make sure '0 minutes' is selected in the allowance section of the sidebar. This'll show you all the deals with a data allowance but no call time. Then it's just a case of finding one you like, and clicking through to the provider to sign up.

What's the cheapest data-only SIMs?

In general data SIMs aren't as cheap as standard phone SIMS. After all, data is expensive.

However, you can do well if you're a light user, with the cheapest data only SIMs generally starting at £5 per month, which will get you a monthly allowance of about 500MB.

3G vs 4G data-only SIMs - which is better?

Some data SIMs give you 4G data, while others just offer 3G.

3G is the previous generation of mobile internet. Plans with 3G are far, far cheaper than those with the more modern 4G, and coverage is much wider. However, 3G internet is slow. Even in an area where you have good signal, tasks like video streaming will take a while to buffer.

4G, on the other hand, is newer and better. Downloads are about five times faster, meaning web pages, pictures, and videos load nice and quickly. The main downside is that 4G plans are quite a bit more expensive - and coverage isn't as wide.

Frequently asked questions

Which networks offer data-only SIMs?

A good variety of networks have deals on data-only SIMs - use our comparison tool to see which ones offer plans that fit what you're looking for.

Look out for networks with additional benefits that would suit you, too. Giffgaff is nice and cheap, for instance; EE has the UK's widest 4G coverage; and O2 gives you free access to its Wi-Fi hotspots, a very useful extra for using your tablet out and about.

You can get data SIM deals from networks such as:

How much data do I need?

The ideal monthly data allowance will all depend on how you use your device.

If you only plan on using mobile internet a little bit, or as a backup when you can't connect to Wi-Fi, a 1GB allowance should be more than enough.

Browsing the web, social media, email, and using most apps uses around 10-25MB data per hour. If you're doing this every single day, you'll likely need a good 3GB or so.

Streaming, meanwhile, is a huge data suck. Watching TV and films can eat up to 2GB per hour, depending on the quality of the video - so you'll need a bigger allowance if you plan on watching Netflix on your tablet.

You can't get unlimited data on a data-only SIM right now, unfortunately - though you can get some nice high allowances. 40GB per month should be plenty for most of us.

If you're really not sure how much data you need, grab a 30-day deal on an allowance that looks about right. That way, you can always change it up or down if it turns out to be too much or too little.

For a bit more info, see our full guide: