Best SIM only on SMARTY: 85GB for £10, 150GB for £12
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See the most competitive options on SMARTY's SIM only this month. We've compared them against other networks to find the best. Last updated: 16th December 2025.
SMARTY's best SIM only deals
Our favourite SIM only deal of the month on SMARTY
just
£10
a month
✔ Unlimited mins and 85GB data See full deal
at smarty.co.uk
(opens in new window)
We think the best value for money SIM only plan on SMARTY for December is their discounted 85GB for £12 £10 deal. It's on a 1‑month plan and comes with unlimited minutes and texts too:
That’s £24 you’d save over a year on the same deal, thanks to the £2 monthly discount.
It's a good deal by SMARTY's standards but price-wise you can still beat this plan on other providers (even ones that still use the Three network). Here are the networks offering it cheaper:
They're also offering 150GB for £12 on SIM only currently
just
£12
a month
✔ Unlimited mins and 150GB data See full deal
at smarty.co.uk
(opens in new window)
For people who need more data, the next best SIM only plan on SMARTY in our opinion is their discounted 1‑month one below. For £15 £12 a month, you get 150GB data, plus unlimited minutes and texts:
That means a total saving of £36 if you added up that £3 monthly discount over a whole year.
If you're open to joining other networks than SMARTY, you can actually get a similar deal for less, even with providers whose SIMs also use the Three network. See the networks that beat it here:
£18 for unlimited data is SMARTY's next best SIM deal in December
just
£18
a month
✔ Unlimited mins and unlimited data See full deal
at smarty.co.uk
(opens in new window)
If you want even more data, another good deal on SMARTY at the moment is their discounted £20 £18 SIM only plan here, which includes unlimited data instead, plus unlimited minutes and texts:
In total, that discount of £2 a month means you’re looking at a saving of £24 if you stayed on the deal for a year.
While it's good enough to be in our pick of SMARTY's best SIM only deals, other providers do still have similar plans for less, even ones that also use the Three network. Here are the networks where it'd cost less:
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How SMARTY compare for benefits and SIM only prices
In our full review of SMARTY we like the fact that you get full access to Three’s brilliant 5G network while also getting good WiFi calling and 4G calling (see our Three vs SMARTY guide here).
They offer all their plans as 1-month no-contract deals. They have a wide range of data plans and typically share better value hidden deals with comparison websites like us which are worth keeping an eye out for.
SMARTY are usually one of the cheapest of all UK networks, and are probably the cheapest provider on Three’s network (alongside iD Mobile).
You don’t get many extra benefits on SMARTY. You do get 10% off any extra plans you add to your account. On top of that, SMARTY promise not to raise the cost of your plan while you’re with them.
Useful link: Read our full SMARTY review
What else you should know about SMARTY’s SIM only deals
You’ll receive your SMARTY SIM card within 2 working days of ordering. You’ll receive a package with every size of SIM for any phone. But you can’t get an eSIM on SMARTY (these networks do offer them).
After your SIM arrives you’ll have 14 days to return it if you’re not satisfied. You’ll only get a refund for what you haven’t used. Here are the full details on how to return your SMARTY SIM.
You don’t need to pass a credit check to join SMARTY as you pay for your plan up front. That makes them a great alternative if you failed a credit check for a Three SIM only contract but want to use their network.
If you want to switch over to SMARTY from another network and you want to keep your number you’ll have to request a PAC from your current provider and send it to SMARTY when you’re ready to switch (here’s how).
Useful link: Compare all SMARTY SIMs