Smarty's 50GB SIM-only plan is £8 a month on a rolling 1-month contract, with unlimited UK calls and texts, and the voucher offer is available until 31 December 2026. That is roughly 16p a gigabyte, the same £8 that Smarty charges for its 16GB plan, which makes 50GB for £8 one of the better-value options in the cheap SIM-only market right now. This guide from SwitchSquid shows who it suits, what it costs over a year, and how it stacks up against Smarty's other plans.
The Smarty 50GB offer in brief
Price: £8 a month.
Data: 50GB.
Calls and texts: unlimited in the UK.
Contract: 1-month rolling, so you can leave with one month's notice rather than being locked in for 12 or 24 months.
Offer available until: 31 December 2026.
How it works: the discount is applied through the offer link. Please check that 50GB and £8 appear in your basket before you pay.
SwitchSquid may earn a commission if you buy through the links on this page, at no extra cost to you. It never changes which deals we feature or how we rank them.
The main attraction is the combination of generous data and flexibility. Most 50GB deals on the market come with a 12- or 24-month contract. A rolling plan lets you try Smarty's service, then stay or leave without a penalty. That suits students, people between homes or anyone who does not want to be tied down.
Who is the 50GB plan good for?
Fifty gigabytes is a lot of data for most people. As an indication, an hour of HD video streaming typically uses around 1.5 to 3GB, music streaming uses a fraction of that, and everyday browsing, maps and social media are modest. That means 50GB could cover:
Someone who streams video on the commute and uses social media heavily.
A person who uses their phone as a hotspot for a laptop a few times a month.
Anyone who finds 10GB or 20GB plans run out before the end of the month.
A household member who does not have home broadband and relies on mobile data for some things.
It is less suitable if you want a large amount of data for permanent home broadband replacement, or if you want to use your phone abroad a lot. Check Smarty's own roaming terms if you travel, since roaming charges and allowances vary between plans and destinations.
Smarty plans compared
Smarty has several plans, all on one-month rolling contracts. These are the prices we have for its main options, so you can see where 50GB fits.
Smarty plan | Monthly price | Approx. price per GB | Cost over 12 months |
|---|---|---|---|
5GB | £6 | £1.20 | £72 |
16GB | £8 | 50p | £96 |
50GB (offer) | £8 | 16p | £96 |
100GB | £12 | 12p | £144 |
Unlimited data | £20 | n/a | £240 |
The 12-month costs assume you keep the same plan all year at the listed price, so check the current price when you order. The key point is that 50GB costs the same as 16GB at £8, so there is no reason to take the smaller plan while the offer is available. If you need much more than 50GB, 100GB at £12 is cheaper per gigabyte, but for many people the extra £4 a month will not be worth it.
Because plans are rolling, you are not locked into your choice. If 50GB turns out to be too much, you can move down. If you find you need more, you can move up. Check how and when plan changes take effect in your Smarty account.
How the offer compares with other cheap SIMs
Cheap SIM-only plans come in two flavours: rolling plans like this one, and 12- or 24-month contracts that tend to have bigger allowances or low promotional prices. When you compare, count the total cost of the contract, not only the monthly price. A £6 plan with a £20 setup charge over 12 months costs more than an £8 plan with no setup charge. In the same way, a very cheap 24-month deal looks better until you want to leave after month eight.
What makes the Smarty 50GB deal stand out is that you get a large allowance with no long-term commitment at £8. If a different provider offers a bigger allowance for a similar monthly price on a 12- or 24-month contract, the total may be lower, but you will not have the freedom to leave. For many readers, flexibility is worth a few pounds.
Rolling plan or 12-month contract: a quick worked example
Imagine you compare Smarty 50GB at £8 with a 12-month SIM-only contract at £7 a month. Over a year, the Smarty plan costs £96 and the contract costs £84, so the contract is £12 cheaper on paper. But if you move house, change jobs or find a better deal after four months, the contract can leave you paying for months you do not need, while the rolling plan lets you walk away. If you are confident you will stay the whole year, the cheaper contract wins on cost. If you are not, the extra £1 a month is a small price for freedom.
It also helps to think about data. A 12-month plan at £7 with 20GB is cheaper but gives you well under half the data of the 50GB offer. Dividing the monthly price by the allowance, as the table above does, keeps the comparison fair. Always look at both the monthly price and the number of gigabytes, then ask how likely you are to stay.
Things to check before you order
Basket price: make sure the 50GB allowance and £8 monthly price show up before you check out. If they do not, do not continue.
Setup charges: check whether there is a SIM or first-order charge at checkout.
Coverage: Smarty uses a mobile network. Check coverage at your home, work and the places you travel most using the network's map.
Handset compatibility: your phone must be unlocked. Most are, but check if your phone came on a contract.
eSIM or physical SIM: see which options are available for your phone on the Smarty page.
Offer end date: the offer is available until 31 December 2026. If you are thinking about it, there is no need to rush on any particular day, but do not leave it until the last minute.
How to switch to Smarty and keep your number
Open the offer link and select the 50GB plan.
Check the basket shows 50GB for £8 a month.
Choose a physical SIM or eSIM, and enter your details.
If you want to keep your number, ask your current provider for your PAC code. You can text PAC to 65075, and the code is valid for 30 days.
Enter the PAC code with Smarty when asked. Your number moves over, usually on the next working day.
Insert the SIM, or scan the eSIM QR code, and test calls, texts and data before you cancel anything else.
If you are leaving a contract, check when it ends. Leaving early could mean paying the rest of the monthly charges, and a PAC code does not cancel your old plan on its own.
Our verdict
If you want a flexible, low-cost SIM with plenty of data, Smarty 50GB for £8 is a strong choice. It beats Smarty's own 16GB plan at the same price, and its rolling contract gives you room to change your mind. If you use less than 10GB, a cheaper plan could save money, and if you need close to unlimited data, the 100GB or unlimited plan will suit you better. Check the basket before you order.
Details are correct as of 19 October 2026. Prices and availability can change, so please check the Smarty page before ordering.
Frequently asked questions
How much is Smarty's 50GB SIM?
£8 a month on a rolling 1-month contract, with unlimited UK calls and texts. The offer is available until 31 December 2026.
Is there a contract?
No long-term contract. The plan rolls month by month, so you can leave with one month's notice. Check your account for the exact notice terms.
Is 50GB enough data?
For most people, yes. An hour of HD streaming usually uses around 1.5 to 3GB, so 50GB covers regular streaming, social media, maps and some hotspot use. Heavy home-broadband-style use will need more.
Can I keep my number?
Yes. Ask your current provider for a PAC code by texting PAC to 65075, then give it to Smarty when you sign up. The code is valid for 30 days.
What is the difference between the 16GB plan and the 50GB offer?
Both cost £8 a month. The offer gives you 50GB instead of 16GB for the same price, so while it is available there is little reason to choose the smaller plan.
What if I want more than 50GB?
Smarty also has a 100GB plan at £12 a month and an unlimited plan at £20. Because plans are rolling, you can switch if your usage changes.
Will the offer disappear on a particular date?
The offer is available until 31 December 2026. Offers can be changed by the provider, so check the price in your basket when you order.
