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The UK’s best Unlimited data SIM only deals

Enjoy endless surfing, streaming, and scrolling with the UK’s cheapest SIM-only unlimited data deal. 

Don’t worry about your usage and get super-fast speeds with 4G and 5G on the UK’s best network. 

Caught the travel bug? Our Unlimited+ plan includes free EU roaming as standard too.

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The UK’s best deal on Unlimited SIMs and best unlimited data deal in the UK: Based on price, speed and reliability. Price: UK's cheapest unlimited SIM and cheapest unlimited multi-SIM package in the UK on a 30 day rolling contract (excluding introductory or time limited offers). Prices correct as of 17.06.2024. Speed & reliability: We use the EE network. EE was the winner in the overall (best) network performance category for both RootMetrics’ H1 2023 testing and for the past ten years in a row. Experiences & coverage may vary. Rootmetrics award is not an endorsement of EE or UW. Visit RootMetrics or ask us for more details uw.co.uk/help/contact-us.

Limitless browsing without the lengthy contract

Unlock endless streaming and limitless browsing on the UK’s best network with a 30-day rolling contract. Our Unlimited+ SIM only plans are the UK's best value deal when you take two or more SIMs.
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Whether streaming films, browsing social media, or working from home, you’ll have all the data you need without changing your handset.

  • 4G & 5G Connectivity

  • Wi-Fi Calling

  • Monthly rolling contract

  • EU roaming included

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The UK’s best deal on Unlimited SIMs and best unlimited data deal in the UK: Based on price, speed and reliability. Price: UK's cheapest unlimited SIM and cheapest unlimited multi-SIM package in the UK on a 30 day rolling contract (excluding introductory or time limited offers). Prices correct as of 17.06.2024. Speed & reliability: We use the EE network. EE was the winner in the overall (best) network performance category for both RootMetrics’ H1 2023 testing and for the past ten years in a row. Experiences & coverage may vary. Rootmetrics award is not an endorsement of EE or UW. Visit RootMetrics or ask us for more details uw.co.uk/help/contact-us.


Save more with our family SIM deal

When you purchase your first Unlimited SIM for £23 a month, you can add up to three additional Unlimited SIMs for only £10 each per month. Go Unlimited for the UK’s cheapest unlimited deal. Plus, get bigger bundle discounts when you take any 2 SIMs. Learn more about family SIM deals.

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Why choose UW for unlimited data SIM

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Flexible monthly contracts

Our unlimited data SIM-only deal runs on a 30-day rolling contract, so you’re not locked in. Decide it’s not for you? You can cancel anytime.

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Ultra-fast 5G speeds

Get lightning-fast speeds and reliable signals. Our mobile plans are powered by the UK’s best network, which has the highest coverage available in the country at 99%. Check your network coverage here.

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EU roaming at no extra cost

Take your data with you on the go. EU roaming is included in our Unlimited+ SIM plan, so you can stream, text, and call home from 45 locations in Europe.

How to switch your mobile provider to UW

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Order your SIM

If you’re new to UW, you can sign up here. If you’re a current customer, you can add an Unlimited+ SIM to your bundle by signing into your account. Or you can give us a call on 0333 777 0777.

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Activate your SIM

Your new SIM should arrive in 3–5 working days. Activate it in your online account or the UW app. You can also find out more about activating your SIM here.

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You’re all set

Once your new SIM card has been activated, pop it into your phone, and you’re ready to go. Need to transfer your old number? We can help with that too.

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Save on more than mobile when you bundle

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Mobile & Broadband

No connection fees or mid-contract price hikes

Save over £100/year vs BT

One of the UK’s highest rated broadband suppliers in the Which? 2024 broadband survey.

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Mobile & Energy

Unlock the UK’s cheapest energy deals

Save over £180/year vs Vodafone

Awarded Best Value for money at the Uswitch Energy Awards

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Save over £180/year vs Vodafone: We’ve compared our 2 Unlimited+ SIM deal with the annualised price of Vodafone’s equivalent services. Based on an average 12 month cost. Prices correct as of 21/06/24.

Save over £100/year vs BT: This saving compares our Ultra broadband on a 18 month contract (available to owner-occupiers and established tenants only) to BT (24 month contract) on fibre 40Mb product or nearest equivalent. Based on an average 12 month cost. Correct at 21/06/24.

Energy: Cheapest energy when you take energy and two other eligible bundle services vs standard variable tariffs offered by major suppliers (large and medium suppliers as defined by Ofgem), for sale nationally, excl. existing customer tariffs. Based on Ofgem's typical domestic usage. Payment by Direct Debit. Correct as of 03/02/2025. Contact us to verify.

FAQs

What does unlimited data mean?

Unlimited data means that you don’t have a cap on your data allowance each month. There are no restrictions on how much data you use, so you won’t have to worry about using up all your allowance.

Our Unlimited+ SIM-only plan is perfect for surfing the internet, taking video calls, or even streaming media, as you can use as much as you need.

How much is unlimited data?

Our unlimited data SIM deals really are unlimited, so there’s no cap on how much you can use. 

However, a Fair Usage policy of 14GB applies whilst roaming in our European zone.

How can I get unlimited data?

To get unlimited mobile data, new UW customers can sign up here.

If you’re an existing UW customer and want to upgrade your current mobile contract or add to your bundle, simply sign into your account or give us a call on 0333 777 0777.

Can I use my unlimited data abroad?

We’re offering EU roaming as part of our Unlimited+ tariff, so you can take your unlimited data abroad and use up to 14GB of it at no extra cost. It’s part of our Roam like Home service, which lets you use your allowance in 45 locations across Europe.

You can also send texts and make calls back to the UK as you would normally with your allowance.


Is there a fair usage policy for unlimited data deals?

Our Unlimited+ tariff has no data usage cap when browsing in the UK, but a Fair Usage policy of 14GB applies whilst roaming in our European zone. This means you can use up to 14GB of your data abroad in 45 locations without incurring any extra charges.

Where can I find more information about UW’s SIM-only deals?

For detailed information about all our SIM-only plans, including data allowances, pricing, and additional features like 5G connectivity and EU roaming, visit our SIM-only deals page.

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The energy price cap

The government has announced that the energy price cap will increase on 1 April 2025. You don’t need to do anything - we’ll be in touch with all our customers on a standard variable tariff in the coming weeks with details of how this will impact you.