Three unlimited data for £18 SIM deal: exclusive lower price
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We've been sent a couple of unlimited data SIM only offers by Three to share with our readers, with lower prices than their sale. Last updated: 25th September 2024.
Here's the deal
Get a cheaper unlimited data deal on Three
(4/5, deal rating - full network review here)
This is the cheapest we've seen Three's unlimited data SIM for over a year. They've had the 12-month version priced at £22 for a long time. Now it's just £18:
It is beatable on price by some of the smaller players but it currently the best priced unlimited data SIM on any of the UK's main mobile networks (Vodafone, EE, O2 and Three). Three's 24-month version is priced higher.
Useful link: Read our full Three network review here
Details and benefits
An exclusive offer that you still order from Three
The plan featured on this page is one that Three have shared with comparison websites like SIM Sherpa to give people better value than what's advertised on the main part of their website.
They do this so they can appeal to people shopping around, without giving away the lower price to people who come to them direct. It's harsh on those people but good for people like you!
Price-wise, we would say this is the lowest in years from Three. They've just reduced it after charging £22 the rest of the year. £18 is definitely lower than you'll get on any other main network:
Useful link: Get the 12-month version of this deal here
It's truly unlimited data on a much-improved network
People do tend to wonder if Three's unlimited data plans give you truly unlimited data. And we're willing to say that yes it is, as long as you're using the SIM for personal usage.
Technically, in the background, there is a vast 1000GB level at which Three might look into whether you're abusing the service. This would be if you were running a server or a public router off it or similar.
Regular people who just so happen to use a shed load of data on their phones will have nothing to worry about. For them, there are genuinely no limits and Three don't throttle your speeds in the UK.
And we think Three are a much better network than ever. You'll be able to enjoy unlimited data with much better 4G coverage than previous years, stunning 5G speeds in the right places and nice extras like WiFi calling.
Useful link: Read our full Three network review here
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