Best Smarty SIM only deals in the UK (March 2025 )

Q: What network does SMARTY use?

SMARTY piggybacks on Three's network , so you'll get 4G and increasingly 5G coverage in most UK areas. However, Three's reach in rural areas might be spottier compared to some other networks. This means you might have weaker signals or no service at all in some remote locations.

SMARTY specializes in great value SIM-only deals that keep things simple and flexible. With no long contracts and a focus on generous 30-day plans, you can enjoy ample data, plus unlimited calls and texts without being tied down.

This guide will review everything you should know to find your perfect SMARTY SIM-only deal in 2025. We'll talk about the advantages of going with Smarty, how to choose the right data allowance for your usage and break down the various deals they offer.

List of SMARTY SIM sim-only deals

Is SMARTY a good network?

Yes, SMARTY is generally considered a good network for those seeking straightforward, cost-effective mobile services. As a mobile virtual network operator (MVNO) leveraging Three UK's extensive network, SMARTY provides solid coverage across most of the UK, ensuring reliable service in urban and suburban areas.

Their simple and transparent pricing plans coupled with the flexibility of no long-term contracts, make the network an appealing option for consumers prioritizing affordability and freedom. While coverage in rural areas may be less robust compared to other major networks, for the average user in typical settings, SMARTY offers a compelling package.

Why choose a SMARTY SIM?

Choosing a SMARTY SIM-only deal offers a host of benefits tailored for flexibility, cost efficiency, and great network experience. Here's why it stands out:

Exceptional coverage. Operating on the UK's Three network that envelops 99% of the country, SMARTY provides widespread 3G and 4G coverage alongside an expanding array of 5G zones.
Impressive speeds. Leveraging Three’s reputation as one of the fastest networks in the UK, its subscribers enjoy rapid data speeds, ensuring smooth browsing, streaming, and downloading experiences.
Flexible plans. All contracts are flexible, operating on a 30-day rolling basis. This minimizes long-term commitments allowing you to modify or cancel your plan as your needs or circumstances change.
Unlimited calls and texts. All plans include unlimited UK minutes and texts as standard – except for their Data Only plans.
International roaming. SMARTY allows the use of your UK data plans within the EU – ensuring you stay connected without additional costs.
No credit checks. The network stands out by offering its SIM-only deals without the need for credit checks. As such, it's a more accessible choice for those who might face barriers with other providers.
Responsive customer support. While it doesn’t offer phone-based support, it provides effective customer service through an accessible web chat system available daily from 8 AM to 8 PM, excluding Bank Holidays.
Refer-a-friend bonus. SMARTY's referral program benefits you and your friend – if they sign up based on your referral. Both of you receive a month of free service.
Simple and affordable data add-ons. Data extras are available for just £1 per GB. So if you ever find yourself running low on data, you can quickly boost your allowance without breaking the bank.
Simplicity. Their plans are straightforward, with no confusing extras or hidden charges.

What to look for in a SMARTY SIM-only contract?

When selecting a SMARTY SIM-only deal, it's crucial to consider these essential factors:

Network speed. Network speed and coverage. If speedy internet is a priority for you, then you are in luck since all of SMARTY’s plans come 5G-ready at no extra cost. But you have to ensure you have a 5G-enabled device to take full advantage of this modern network technology.
Contract Length. SMARTY emphasizes flexibility with its 1-month rolling contracts. While this offers month-to-month freedom, it may not suit those looking for longer-term commitments which might come with discounts.
Data Allowance. Assess your typical monthly data usage to select a plan that best suits your needs without incurring extra charges. SMARTY caters to a broad spectrum, offering plans ranging from 2GB to unlimited data which makes it ideal for both light and heavy data users.
Cost-effectiveness. Price is another significant aspect. As such, it is vital to compare costs across the various data options available from this provider to ensure you get the best deal. Their cheapest plan starts at £5 monthly.
Roaming Capabilities. If you travel often or plan to use your phone abroad, consider what roaming options there are. SMARTY offers EU roaming within your plan with no extra charge, although there's a fair usage limit of 12GB per month.

How does Cybernews deal comparison work?

We collect a live database of deals and special offers from the most popular mobile network providers, including Three, Vodafone, O2, and Tesco. Since the data is taken straight from the provider, you can be sure that the prices and all the other offer details, such as contract length and monthly cost, are up to date.

If you’re looking for a contract deal with a handset, you can choose from the newest models from the most popular phone brands - Apple, Google, Samsung, Xiaomi, Sony, Motorola, OnePlus, and many more. Instead of going through several network providers’ websites, use the filtering system to select the best SIM-only or contract with a handset deal!

What SIM only deals does SMARTY offer?

When exploring the world of SIM only deals by SMARTY, it's clear they cater to a range of customer needs with flexibility at the forefront. Below is a breakdown of SIM only deals you can get with SMARTY:

Unlimited data SMARTY deals. Their plans go up to 200GB and offer ample browsing, streaming, and downloading capacity. These truly unlimited, high-capacity plans ensure that most users will rarely, if ever, run out of data.
1-month SMARTY deals. SMARTY doesn't offer traditional 12-month contracts. All their plans are 1-month rolling, which means you can switch plans or leave without the hassle of a 12-month commitment that can often tie you down if the service doesn't meet your expectations.
5G SMARTY deals. For those eager to tap into blazing fast internet speeds, SMARTY’s 5G plans connect you to the UK's best 5G network. Although, slightly pricier than their 4G counterparts, these plans deliver superior connectivity and speed.

SMARTY SIM only deals contract length

The beauty of SMARTY lies in its flexible contract structure. As previously mentioned, all their plans are 1-month rolling contracts, giving you complete freedom and control over your mobile service.

This means you can simply upgrade or downgrade your plan, cancel your service, and avoid price hikes which is typical with some traditional mobile contracts after the initial introductory offer period.

Can I use my SMARTY SIM abroad?

Yes, within the EU, you're golden. Most SMARTY plans include unlimited calls & texts and up to 12GB of data you can use just like at home with no sneaky fees.

However, when heading outside the EU, you'll need an "Out of plan" add-on for calls, texts, and data. And since the prices of these plans vary depending on the country you visit, be sure to check SMARTY's website for details before you go. Also note that these are pay-as-you-go add-ons - so use them strategically.

Does SMARTY offer SIM plans for bad credit?

Yes, SMARTY is a good option if you have bad credit and are looking for a SIM plan. They specifically advertise that no credit check is required for any of their SIM deals. This is because you pay for their plans monthly in advance, so they don't rely on your credit history to assess risk.

Their plans are also flexible, with no long contracts. You can easily switch plans or cancel your service at any time if your needs change. This is a big advantage compared to some other providers who might offer plans for bad credit but lock you in for a long period.

Can I get 5G enabled SMARTY SIMs?

You don't need a special 5G SIM card with SMARTY. The good news is all their SIM cards, new or old, are already 5G ready and come with no extra cost. To access 5G, you'll need two key things:

5G-enabled device: Make sure your phone or tablet actually supports 5G connectivity. SMARTY has a list of devices they've tested and confirmed work with their 5G network. If your device isn't on the list, it might still work with 5G on their network, but they can't guarantee it.
Being in a 5G coverage area. 5G availability is still expanding. Check SMARTY's coverage checker on their website to see if 5G is available in your area.

Other networks that offer good SIM plan alternatives

With a wide selection of UK mobile networks available, you're sure to find a plan that aligns with your specific usage and financial considerations.

Whether you require a high-data allowance, a basic talk and text plan, or the latest smartphone, the mobile market in the UK has something to offer everyone. Here’s a list of networks that offer good SIM plans:

ASDA Mobile. Asda Mobile is an MVNO that runs on Vodafone's network, so you'll get extensive coverage throughout the UK. Its SIM Only plans are available in 12 and 24-month options, as well as a Pay As You Go service.
iD Mobile. This mobile network provides service through Three's extensive network. The company's known for its free data rollover service that enables users to carry over unused data from one month to the next. Additionally, iD Mobile has a plan with unlimited data for those with larger consumption needs.
Lycamobile (EE). Lycamobile is another network that provides good value for money on international calls and runs on the EE network. They also have a variety of SIM plans, including pay-as-you-go and monthly contracts.
Lebara Mobile. Lebara runs on the Vodafone network and is a good option if you make a lot of international calls. Their international call rates are very competitive.
VOXI. VOXI is a flexible mobile plan without a long-term contract or credit check that lets you cancel at any time. In addition to flexible usage, it also offers unlimited access to social media apps that won't count against your data.
Giffgaff (O2 network). giffgaff Mobile offers SIM-only plans known as goodybags. These cost-effective and simple plans are available with various flexible options, including 30-day rolling contracts, pay-as-you-go, and 18-month terms. You can adjust your data allowance each month to suit your usage needs.
Talkmobile (Vodafone network): Talkmobile is an MVNO that operates on the Vodafone network. They offer a variety of SIM-only plans with a focus on data.
O2. O2 is one of the four major mobile network operators in the UK. It has a variety of SIM deals available, featuring 5G connectivity, access to priority tickets at O2 venues, and included EU roaming.
Three Mobile. Although Three operates the Smarty network, it has great options to consider if you're searching for an affordable SIM plan, unlimited data, or something in the middle. Three’s sim-only deals come with 5G as standard – without any additional charges.
EE. EE is one of the largest mobile networks in the UK with a wide range of SIM plans to suit all budgets. They also have the best coverage of any network in the UK.

FAQ

What network does SMARTY use?

SMARTY piggybacks on Three's network, so you'll get 4G and increasingly 5G coverage in most UK areas. However, Three's reach in rural areas might be spottier compared to some other networks. This means you might have weaker signals or no service at all in some remote locations.

Are SMARTY SIM only deals cheaper than contracts?

SMARTY doesn't offer contracts. Instead, you buy your phone separately. This can be cheaper than phone contracts, especially if you already have a phone or plan to keep it for a while. With contracts, you often pay for the phone cost hidden within the monthly fee. Instead, with SMARTY, you pay upfront for your phone and a monthly fee for data, letting you avoid credit checks and potentially save money in the long run.

Can you keep your phone number if you switch to a SMARTY SIM only deal?

Yes, you can keep your phone number when switching to SMARTY. Just request a PAC code from your current network and provide it to SMARTY during the switch. The PAC code authorizes transferring your number to their network.

Does SMARTY have any disadvantages?

SMARTY keeps things simple and affordable, but there are a few drawbacks to consider. First, they focus on SIM-only plans, so you won't find phone contracts with bundled devices. This means buying a phone separately. Second, there are no frills like data rollover - any unused data expires each month. Customer service options are also more limited compared to some larger networks. Finally, while coverage is expanding, 5G access might be spotty in rural areas.

Do you need an unlocked phone to use a SMARTY SIM?

SMARTY SIMs work with any unlocked factory unlocked device. If you have an older phone, however, it might be locked to your previous network. So, you'll need to get it unlocked to use a SMARTY SIM. You can do this by contacting your old network provider and they can often do it remotely or provide an unlock code. However, there might be a fee involved – so check with your old network first.

Best SMARTY SIM-only deals in 2025