Unlimited data SIM-only deals

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Unlimited Data SIM-only Deals

Whether you’re looking for unlimited video streaming, all-inclusive social media or free international roaming, SIM-only plans offer incredible value. Bring your own device and you can take advantage of amazing unlimited SIM-only deals.

Why choose an unlimited data SIM?

While most homes and workplaces are equipped with Wi-Fi, it’s not always possible to connect to a wireless network. People who use their phones to stream live sports games during their daily commutes or punch directions into Google Maps often find themselves chewing through loads of data. This is where unlimited data SIM-only plans step up.

With limitless mobile data, you’ll never have to worry about your Premier League stream cutting out at a crucial moment. You’ll also avoid the hassle of asking for Wi-Fi passwords when visiting friends and family. Not to mention the frustration of continually scouring for public networks when you’re out and about.

Want to know more about the benefits of an unlimited data SIM card? Here’s why you’ll love limitless data:

Take full advantage of 5G

5G connectivity doesn’t necessarily chew through more data. For example, if you’re downloading a Netflix episode to your tablet, you’ll use the same MBs as you would on a 4G connection. That said, 5G is a LOT faster. This makes it easier to download bigger files and more of them. You’ll probably find yourself upgrading to the high-resolution 4K version instead of the standard 1080p file.

Similarly, many streaming services automatically select bulkier files when 5G is detected. It’s good news for your viewing experience. But it can mean your data starts to run low. Cue unlimited data only SIM card deals. With limitless data, you can take full advantage of 5G coverage. No need to worry about whether that audiobook will eat up your data or if you have enough MBs left to watch the football match. Simply steam, download and enjoy.

Limitless streaming

From The Crown and Peaky Blinders to Black Mirror and Sex Education, Netflix is home to some of the UK’s favourite TV shows. Let’s not forget other streaming giants like Amazon Prime Video, Disney+ and Apple TV. And a special mention to BritBox, where you’ll find a curated collection of mysteries, dramas, comedies, documentaries, lifestyle shows and more. All with lashings of British charm. Then there’s YouTube, a bastion for viral videos, vloggers and ‘how to’ guides.

If you’re a sports fan, you’ll go crazy for the best SIM-only unlimited data deals. Whether you’re watching the Arsenal match or tuning into The Ashes, streaming sports can power through bucketloads of data. With an unlimited data SIM-only plan you can watch all the action, with no interruptions.

Unlimited apps

From banking to meal delivery services, there’s an app for everything these days. They’re incredibly useful and thanks to phones with huge amounts of storage, you can download as many as you like. If you have enough data. Take advantage of the cheapest unlimited SIM-only deals and you can download as many apps as you like.

Apps aren’t just for social media and streaming platforms. In the UK, the NHS App has been downloaded more than 30 million times. Microsoft Teams is another hugely popular app for UK users.

Bottomless social media

Whether you’re a TikTok disciple or an Instagram addict, unlimited SIM deals keep you connected to your socials without a fuss. The average Brit spends around 110 minutes per day on social media, which can grind through a huge amount of data. Especially if you’re watching Instagram reels, TikTok videos and YouTube clips. If you’re a social media butterfly, you can’t go wrong with the best SIM-only unlimited data deals.

Data on-the-go

Navigation apps like Google Maps are extremely useful but can use mountains of data. The same goes for ridesharing apps like Uber. If you run out of data, you’ll be left high and dry. With unlimited data SIM plans, you’ll never have to worry about not being able to get directions or book an Uber.

What providers offer unlimited SIM deals?

Looking for the cheapest SIM-only unlimited data? You’ll find staggering deals from all the top UK providers, as well as smaller companies.


When it comes to speed and reliability, it’s hard to beat unlimited SIM-only plans from EE. Enjoy some of the fastest 4G and 5G download speeds in the UK, plus excellent coverage. You’ll pay a little more than with some other providers, but if speed is a priority, you can’t go wrong.


Three is a top performer when it comes to the best unlimited data SIM deals. In terms of 5G and 4G download speeds, the company is right up there with EE. 5G coverage is exceptional and you can also take advantage of features like personal hotspot compatibility, which allows you to share your unlimited data with other devices.
For travellers, the Go Roam Around the World feature is a huge bonus. It allows you to use your bottomless data in dozens of countries around the world, for a small fee. Three also offers some of the cheapest unlimited data SIM plans in the UK. This makes it a favourite with budget-conscious Brits.


Vodafone offers a smorgasbord of choice when it comes to unlimited internet SIM-only plans. They’re based on speed and range from 2Mbits/sec to 10Mbits/sec. Naturally, you’ll pay more for the faster speeds. Upgrading is a good bet if you have a 5G-ready phone. The company boasts some of the most extensive 5G coverage in the UK, though speeds can be a little slower compared to providers like Three, O2 and EE.


Looking for an unlimited data plan SIM-only? O2 has some great deals and offers top-tier 4G and 5G speeds. 5G coverage can be a little lacklustre, though if you live in a major town or city, it shouldn’t be an issue. O2 really raises the bar when it comes to extras. Perks like free Apple Music for six months help win over customers – not to mention O2 priority when buying tickets.

Virgin Mobile

Looking for unlimited data SIM deals that don’t tie you down? You’ll love the latest offerings from Virgin Mobile. Unlike some other major providers, Virgin hooks you up with unlimited data, minutes and texts on short contracts. There’s zero upfront cost and no need to commit to 12 or 24 month contracts.

iD Mobile

If you’re on a budget, the unlimited SIM-only from iD Mobile is virtually unbeatable. The company drastically undercuts the competition and offers amazing prices supported by the Three network. No, you won’t get the same speed, reliability and coverage as Three. But it comes pretty darn close. The SIM is also 5G-ready, which means you can take advantage of the advanced network, depending on the phone you’re using.


Unlock unlimited data with a SIM from low-cost mobile network provider, giffgaff. Whether you’re a sports fanatic, a workaholic or a social media fiend, giffgaff offers some of the cheapest unlimited data SIM deals in the UK.


Unlimited social media has always been a USP for VOXI. If you’re a regular on platforms like Instagram and TikTok, you’ll love the unlimited, 5G-ready SIM deals available from this Vodaphone-powered provider.

Unlimited data SIM FAQs

Can I get unlimited data SIM plans in the UK?

Absolutely. Many of the country’s top mobile network providers now offer cheap SIM-only deals unlimited data. This is a big change from just a few years ago, when many providers placed caps on data usage.

Is an unlimited data SIM more expensive?

This depends. As usage is unrestricted, an unlimited data SIM will generally be the most expensive offering from mobile phone providers. That said, SIM-only deals are often much cheaper than plans that include a handset.

What size SIM do I need?

Unlimited data SIMs are available in three sizes – nano, micro and standard. Most unlimited data only SIM cards feature a pop-out design that allows you to customise your size based on your phone.

Do I need an unlimited data SIM?

If you want total peace of mind when it comes to data usage, the answer is yes. SIM contracts unlimited data mean you’ll never have to worry about how much data you’re using or whether you’re connected to Wi-Fi.

Do I need an unlimited data SIM for 5G?

Technically you don’t need a SIM-only contract unlimited data if you’re using a 5G device. However, as mentioned earlier you’ll probably use more data by default when connected to the lighting-fast network.

Do I need to sign a contract?

Most unlimited data SIM ask you to sign onto a contract, usually for 12 to 24 months. Generally, longer contracts unlock the best deals. Shorter contracts are usually a little pricier but more flexible. You’ll also find some providers that offer unlimited SIM-only deals on rolling monthly contracts. These are a great option if you’re just visiting the UK, or you don’t want to commit to a long-term contract.

Can I use my unlimited data SIM overseas?

This depends on your contract and provider. Most leading mobile network providers offer schemes that allow you to use your unlimited data overseas. For example, giffgaff offers free EU roaming with its unlimited data SIM card. This makes it one of the best SIM-only unlimited data deals for travellers.
Read the fine print carefully though. The best SIM deals for unlimited data can sometimes come with conditions like an additional fee or a daily data cap. It should be written clearly in the terms and conditions of your contract. If you’re unsure you can always contact your mobile phone provider to clarify. The last thing you want is unexpected costs during your holiday.

Are there upfront costs?

No. Most unlimited SIM-only deals don’t incur any upfront costs. This means you can get connected without your wallet taking a hit. You’ll generally pay monthly, which makes it easy to manage the costs of your unlimited data SIM contract.

How much can I expect to pay for unlimited data SIM-only?

As a general rule, the best unlimited SIM-only deals start at around £16 per month and go right up to £45+ per month for all-you-can-eat plans. While all offer unlimited data, factors like speed, coverage and reliability can vary. Some of the more expensive plans also offset the cost with exclusive extras like free Amazon vouchers.