Three Discount Codes
Up to 20% off for Students
Valid until 31/12/2026
Take advantage with Get 40GB 3-SIM Plan for only £7 per Month
No expiry date
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Give These Just-Expired Three Voucher Codes & Deals a Go
Feel free to try one of these Three discount codes that may still work.
Three Voucher: 35% off all Items
This voucher is unverified
Three Promo Code: Take 20% off Your Order
This voucher is unverified
Three Promo Code: Take 50% off JLab JBuds Lux ANC Over‑Ear Headphones plus Free Delivery for Three+ Members
This voucher is unverified
Receive 30% off Selected Accessories at Three
This voucher is unverified
Three Promo Code: Take 50% off Anker MagGo 15W 3-in-1 Charger Orders
This voucher is unverified
15% off National Express Tickets for Monday-Thursday or 5% off for Friday-Sunday with Mobile App with this Three Deal
This voucher is unverified
Get 3 for 2 on Accessories at Three
This voucher is unverified
40% off Anker Range with Three+ with this Discount Code
This voucher is unverified
Free Click and Collect Service
This voucher is unverified
Get Exclusive Deals and Latest Promotions with Mobile App Download
This voucher is unverified
Save at Three with 3 for 2 on Selected Accessories
This voucher is unverified
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£10 off on the Upfront Cost with any Pay Monthly Devices with this Carphone Warehouse Discount Code
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Receive £5 off Upfront Costs on Vodafone Pay Monthly Handset Orders with this Discount Code
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Explore All Valid Three Deals & Sales for February 2026
Discount | Three Voucher Details | Expires |
|---|---|---|
20% | Up to 20% off for Students | 31 December 2026 |
£7 | Take advantage with Get 40GB 3-SIM Plan for only £7 per Month | No expiry date |
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Useful tips and information
Written by Eliza Macinnes
Learn more about this author
Three student discount
With the Three student discount, you can save up to 50% on SIM-only deals and 20% when you purchase a device with your contract. Secure the half-price student deal by signing up with UNiDAYS and verifying your student status. Upon successful verification, the student code will be automatically sent to your inbox.
Three birthday discount
It's always worth checking your inbox when your special day arrives. Three sends out attractive birthday discounts that offer price reductions on your next order.
How to use your Three voucher code
On the hunt for great bargains when shopping for a new smartphone or SIM-Only deals, make sure to pick one of our Three vouchers before placing your order. That way, you'll be sure to secure big savings. Simply copy the code, pick the smartphone or contract you'd like to buy, and proceed to the payment section. You can paste your Three coupon code into the box "Promo code". Clicking on "Apply" will reduce your total by the promised discount.
What to do if your Three discount code isn't working
In some cases, you may run into an error code while redeeming your Three promo code. If so, pay attention to the following tips:
Only use codes meant for your customer group.
Verify whether the code is meant for the selected Three offer.
Ensure you've exceeded the minimum order value of your code.
Exclusively apply valid coupons.
Can I benefit from any existing customer deals?
As an existing Three customer, you can take advantage of several cashback offers. For instance, secure an attractive cashback for SIM-only orders or when you purchase the newest smartphone. All of the available cashback deals can be found right here on our Voucherbox website.
Three first order discount
New customers have the opportunity to get the first three months for free when purchasing a SIM-only plan. Take advantage of the exclusive Three offer by choosing the plan that works best for you and clicking on "Buy now". The free months will be automatically credited to your account and billing will only start once the first three months have expired.
Does Three offer a blue light discount?
Blue Light Card holders can regularly take advantage of discounted SIM-only plans at Three. Here's how to claim the attractive NHS discount:
Log in to your account on the Blue Light Card platform.
Use the search bar to find the Three discount code.
Copy down the code and use it at the checkout.