SMARTY Active Deals, Sales & Codes in October, 2026

SMARTY is a UK SIM-only mobile network launched in 2017, operated by Three UK, part of CK Hutchison Holdings. It runs on Three’s network infrastructure, covering roughly 97% of the UK population with 4G and 3G connectivity. We rate SMARTY among the strongest options for cost-conscious mobile users — transparent pricing, no lock-in contracts, and a money-back scheme on unused data set it apart from traditional providers.

Every SMARTY plan operates on a rolling monthly basis with unlimited calls and texts included as standard. Tariffs range from budget-friendly options like 15GB for £15 a month up to unlimited data from £17 monthly. In our view, the standout feature is the data refund: at the end of each billing cycle, SMARTY credits your account for any data you didn’t consume, meaning lighter users effectively pay less than the headline plan price.

For households, SMARTY’s Group plans offer a 10% discount on every additional SIM, with the ability to manage up to 8 SIMs from a single account. Student discounts and a referral reward scheme provide further savings. Several tariffs bundle free Amazon gift cards, and all customers get free WiFi on the London Underground. Promotions tied to Black Friday and the back-to-university season appear throughout the year — we’ve collected the current best deals on this page, so it’s worth bookmarking.

When’s the best time to sign up for SMARTY?

SMARTY’s strongest promotions tend to land during Black Friday, Boxing Day, and the back-to-university period in September. We’ve seen tariff drops and bonus gift card bundles appear during these windows. If you’re not in a rush, waiting could save you more. That said, SMARTY’s rolling contracts mean there’s no penalty for signing up now and switching plans when a better deal arrives — you’re never locked in.

Which SMARTY plan offers the best value?

It depends on your data habits. Light users who mostly connect to Wi-Fi will be fine on the 15GB plan at £15 a month. Heavy streamers should look at the 80GB plan for £10 — at that price it’s among the best value we’ve seen on any UK network. SMARTY’s unused data refund means lighter months automatically cost less, so the risk of overpaying is minimal.

How do SMARTY Group plans save money?

Group plans knock 10% off every SIM after the first. We calculate that a household with four SIMs on £15 plans saves £6 monthly — £72 a year — before unused data credits. Each member picks their own plan, and the group owner manages everything from one dashboard. You can run 2 to 8 SIMs under a single account.

What should I know before switching from a contract phone?

SMARTY is SIM-only, so you’ll need an unlocked handset if yours came from elsewhere. Getting your number across is straightforward — under Ofcom’s text-to-switch rules, a single text gets you a PAC code. The key thing we’d suggest checking before switching is your existing contract’s end date. Leaving early typically triggers an early termination fee covering the remaining months, so do the maths on whether switching now outweighs waiting it out.