Compare Three SIM Only Deals

Three runs its own network rather than borrowing another operator's, which is why a number of cheaper SIM-only brands sit on top of it. As one of the four main UK networks, it carries the full feature set you would expect, with 5G in the areas where Three has switched it on. As always, coverage varies by location, so check Three signal at your postcode before you commit.

Buying a SIM direct from Three gets you the network's own range, including its unlimited data plans for heavier users. Plan lengths and allowances vary, so the live deals above are the best place to see what is currently available and how long each one runs. Because you are dealing with the network itself, you also get its full account features and customer support rather than a slimmed-down version.

The clearest reason to go direct is Three+, the network's rewards programme for customers, which the budget brands on the same network do not offer. Three also leans heavily on data, so if your priority is a generous or unlimited allowance, the network markets itself around exactly that. Add 5G where it is available and you are getting the full Three package rather than a stripped-back one.

Three suits people who want to deal with the network directly and value its extras, such as Three+ rewards and the option of unlimited data. If you would rather have the full account experience and support that comes from the network itself, going direct makes sense. If budget is your single biggest concern, it is worth knowing the same coverage is available for less through other brands on the network.

If you like Three coverage but want to spend less, iD Mobile and Smarty both run on the same network. You get matching signal, but you trade away Three+ rewards and some direct-network extras. iD Mobile adds data rollover and capped contracts, while Smarty keeps things to simple low-cost rolling plans. Compare all three on price and the features you care about.