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Three's unlimited data SIM only deals still beat everything despite fierce competition

SIM only deals
(Image credit: Future)

Since way back before Black Friday, Three dropped a major market-leading unlimited data SIM only deal. Nothing managed to come along and beat it through the end of 2019 or early 2020 so Three did the obvious released a second market-leading plan.

Both of these deals get you unlimited data on the Three network. One costing just £18 a month for 12 months and the other providing £20 a month bills with the first six months at half price bills.

While a quick glance through our guide to the best SIM only deals will show these still come out on top, they have had some strong competition to battle. EE and its 60GB for £20 offer, Smarty and its multitude of bargain big data plans or even Voxi and its unlimited social media deal.

Three's half price SIM only deal promotion:

SIM only from Three | 24 months | Unlimited data, calls, and texts | £10 a month for the first six, then £20 a month
Getting unlimited data for just £10 is a rare sight and one that only Three has managed to achieve so far. Of course, those bills only last for six months and then you'll have to pay £20 a month for the last 18, which is still one of the best prices around. The only issue is that it lasts for 24 months. Too long? Try the offer below.
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Three's £18 a month unlimited SIMO:

SIM only from Three | 12 months | Unlimited data | Unlimited calls and texts | £18 a month
24 months too long for you? Or would you rather keep your bills constant throughout? Either way, this offer is an excellent alternative to what you can get above. Yes, it's not half price but it is still exceptional, topping everything else on the market.
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Why should you choose Three Mobile?

If you haven't already been won over by this amazing offer from Three then you'll be excited to hear that the network doesn't shy away from offering up some extra incentives as well.

Whether that be free exclusive prizes or extra roaming. You can see all of the best parts of a Three SIM only deal or Three mobile deals down below.

  • Wuntu - Exclusive offers and freebies with Three's rewards app
  • Go Roam - Roaming abilities in 71 worldwide countries at no extra cost
  • Travel Swagger - Get travel upgrades with Easyjet with bag drop and early boarding