Compare SMARTY SIM Only Deals

Why choose a Smarty SIM only deal?

Smarty is Three's low-cost sub-brand, built around radical simplicity: every plan is 1-month rolling, there are no price rises mid-plan, no credit checks on most plans, and what you see is what you pay.

What you get with Smarty

Smarty offers some of the cheapest unlimited data deals in the UK, along with big-data bundles that routinely undercut the main networks. On certain plans, unused data earns a discount off your next month's bill — a genuinely unusual perk. 5G is included at no extra cost, tethering is unrestricted, and everything is managed through a clean, simple app.

Things to know before you switch

Coverage comes from Three. Because plans are no-contract and most skip the credit check, Smarty is one of the best options if you want flexibility or have a thin credit file. There are no stores and support is online-first. Keeping your number is the usual drill: text PAC to 65075 and enter it during Smarty sign-up. See how Smarty stacks up in our full SIM only deals comparison.