Updated: 23 October 2026 · Guy Darbyshire · Reading time: 6 min
Black Friday 2026 falls on Friday 27 November, with Cyber Monday on 30 November. If you’re planning to join Three UK, the fortnight around that weekend is usually one of the cheapest times of year to sign up.
This guide covers what Three has done in previous Black Friday events, what to expect this year, and how to claim £40 referral cashback when you sign up through a referral link, plus what Three’s terms say about using it with sale deals. We’ll update the page as Three announces actual 2026 offers.
Quick answer: Three hasn’t confirmed its 2026 Black Friday dates yet, but expect deals to run from around mid-to-late November into early December. If you join Three as a new customer through the referral link on this page during that window, you’ll get Three’s Black Friday price and a separate £40 cashback (£20 on SIM-Only), paid to your PayPal or UK bank account 3–8 weeks after your plan activates. You keep 100% of the cashback — we’re paid separately.
Three’s official Black Friday sale hasn’t been announced yet. Here’s what to expect for 2026:
We’ll update this page with Three’s actual 2026 dates and offers as soon as they’re announced.
Three’s Black Friday sale has followed the same shape two years running: a cheap unlimited SIM, discounted handsets on its Lite tariff, and (in 2025) a broadband offer. Here’s exactly what Three ran, taken from its own press releases.
SIM-Only
5G Home Broadband
Pay Monthly phones (Lite tariff, unlimited data)
Note: these were Three’s prices in past years and aren’t a guarantee of 2026 pricing. All Three plans are subject to annual price rises each April. We’ll replace this section with the real 2026 offers as soon as Three announces them.
Probably, but it isn’t guaranteed. Three’s Refer a Friend terms say the reward isn’t available “in conjunction with any other offer”, and they don’t spell out what counts as another offer. In 2024 and 2025, Three’s Black Friday deals were sale prices on its standard plans rather than separate vouchers or codes, so we expect them to qualify. We’ve asked Aklamio, which runs the scheme, to confirm, and we’ll update this page with their answer. The reward is £40 for Pay Monthly phones and Home Broadband, and £20 for SIM-Only.
How to claim:
No vouchers, no e-money card. Just cashback.
Important: Three sometimes shows different prices to first-time visitors vs returning customers. If you’ve been on Three’s site earlier in the day comparing tariffs, clear your browser cookies before clicking our referral link – otherwise the referral may not track and you won’t earn the cashback.
Based on what Three offered in 2025, these are the three deals most worth watching for:
Best for heavy users: Three Unlimited SIM Was £20/month on a 24-month plan in 2025. Add £20 cashback and the first year works out at £220 (about £18.33/month).
Best for light users: Three 120GB SIM The 2025 deal was £8/month for six months, then £18.30/month. Add £20 cashback and the first year works out at £137.80 (about £11.48/month). Check the price after the first six months, because it more than doubles.
Best for home internet: Three 5G Home Broadband Was £18/month on a 24-month contract in 2025. Add £40 cashback and the first year works out at £176 (about £14.67/month), before any switching credit Three offers. 5G home broadband speeds depend on your local signal, so check coverage at your postcode first.
The cashback figures above assume the referral reward applies to Black Friday plans. See “Can you get £40 cashback on a Three Black Friday deal?” above.
Is Three UK’s Black Friday sale online-only?
No. Three’s high-street stores also run the sale, but the exact deals differ. Online tends to have the biggest SIM-Only and Broadband cuts; stores tend to have better phone contract bundles because you can trade in a device in person.
Can I claim the £40 cashback if I’m upgrading rather than switching?
Only if you’re a new customer to Three at the time of sign-up. Upgrades on an existing Three account don’t qualify. If you’re currently on Three, you’d need to leave and rejoin — usually not worth it unless you’re near end-of-contract.
When does the £40 cashback actually arrive?
Usually 3 to 8 weeks after your Three plan activates. The reward is confirmed once the 14-day cooling-off period has passed and your first bill has been paid. You’ll then get an email inviting you to claim, and you can withdraw to PayPal or a UK bank account at no cost.
Is threesaver.co.uk an official Three partner?
No — we’re an independent cashback and referral site. Three doesn’t authorise, endorse, or partner with us. The cashback is paid by Aklamio, not by Three or by us. We’re paid a separate referral commission by Aklamio; it doesn’t come out of your reward.
If you already know you’re joining Three during Black Friday, bookmark this page. When Three’s Black Friday tariffs go live (Black Friday itself is Friday 27 November), come back and click the referral link, then finish your sign-up in that same browser session so the cashback tracks.
Written by Guy Darbyshire, editor of threesaver.co.uk. Guy has been switching between UK mobile networks for over a decade and started threesaver to help other people navigate Three UK’s plans and stack cashback offers. More about Guy.
