Best SIM Only Deals on Three 5G
SIM Only Deals UK
The UK's best SIM only deals on Three's 5G network. As a leading SIM only provider and mobile network provider, Silux Mobile lets you keep your phone, ditch the contract, and get 5G + Go Roam in 71+ countries from just £5/month.
5G Included 71+ Countries Roaming No Contract
The Silux Mobile Promise
No price increases
Your price is locked — no price rises during your contract, ever
Free upgrades
Upgrade your plan or SIM for free, any time
No credit checks
No credit checks on our SIM contracts
No hidden fees
No setup fees, no exit fees — cancel any time
Choose Your SIM Only Plan
Calls, Texts & Data
Full UK calling, texts and data bundle — ideal for everyday use
View plansData Only SIM
Pure data for tablets, MiFi devices and mobile broadband
View plansMulti-SIM Deals
Multiple SIMs on one bill — perfect for families or businesses
View plansRoaming SIM
Use your SIM abroad in 71+ countries — included in Three Go Roam
View plansSIM Only Deal FAQs
What are SIM only deals?
SIM only deals are mobile phone plans where you get just the SIM card — no handset included. You keep your existing phone, pay less per month, and choose from flexible monthly plans or 12-month contracts.
What is the best SIM only deal in the UK?
The best SIM only deal depends on your needs. Silux Mobile offers competitive SIM only deals on Three's 5G network with Go Roam international roaming in 71+ countries, unlimited data options, and no contracts from as little as £5/month.
Do SIM only deals include 5G?
Yes — all Silux Mobile SIM only deals include 5G at no extra charge. Three's 5G network covers major UK cities and is expanding rapidly.
Can I use a SIM only deal with any phone?
Yes — our SIM cards work with any unlocked smartphone, tablet, or device. If your phone is locked to another network, you'll need to unlock it first.
How do SIM only deals save me money?
By not paying for a handset, you only pay for your minutes, texts and data — making monthly bills significantly cheaper. Many customers save £20-30/month by switching to SIM only.
Will my price increase during my contract?
No. Silux Mobile never raises your price mid-contract — there are no price increases during your contract and no annual or inflation-linked price rises. The price you sign up at is the price you pay.
Are plan and SIM upgrades free?
Yes. Upgrades are free — move to a bigger data plan or a better SIM whenever you like at no extra cost, with no upgrade or admin fees.
Do you run a credit check?
No. There are no credit checks on our SIM contracts, so you can join Silux Mobile regardless of your credit history. No credit check is required to order or activate your SIM.
Is Silux Mobile a good mobile provider?
Yes. Silux Mobile is a UK SIM-only and mobile network provider on Three's 5G network, with cheap SIM deals, no price rises, free upgrades and no credit checks on SIM contracts.