No Contract SIM in Cardiff
No contract SIM cards in Cardiff — 30-day rolling plans from £5/month. Cancel anytime, no credit check.
Silux Mobile gives Cardiff flexible, no-contract SIMs on Three's 5G/4G network. No price increases and no credit checks — free Royal Mail Tracked 48 delivery across Cardiff.
Why Cardiff Chooses No-Contract Silux
Delivered to Cardiff
Free Royal Mail Tracked 48 delivery (2–3 working days) anywhere in the UK including Cardiff and Cardiff.
Three 5G in Cardiff
Our SIMs use Three's 5G/4G network with strong coverage across Cardiff and surrounding areas.
From £5/Month
Cheaper than Lebara, Giffgaff and SMARTY — with 5G included. Roaming is an extra cost and varies by package.
Flexible Plans
Every plan starts from 1 month — SIM cards on 30-day rolling plans or 3 to 24-month contracts, and rolling monthly broadband.
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 hidden fees, no price increases
No-Contract SIM Plans — Cardiff
30-day rolling. Cancel anytime.
Calls + Data
Unlimited calls
£8/mo
- 30GB data
- Unlimited calls & texts
- 4G/5G
- 30-day or contract
Unlimited
Unlimited
£18/mo
- Unlimited data
- Unlimited calls & texts
- 5G
- Roaming extra — varies by package
Three 5G Coverage in Cardiff
Three's 5G/4G network covers Cardiff and Cardiff with strong indoor and outdoor signal — over 99% UK population coverage.
Check Your Cardiff PostcodeNo Contract SIM in Cardiff — FAQs
What happens if I go over the fair usage policy in Cardiff?
It depends on the network. As of August 2026, Three is more flexible and lenient with its fair usage policy, and it is rare that we need to warn customers. Vodafone and O2 are much stricter: if you go over more than twice, you will be notified to monitor your usage.
What is the cheapest no-contract SIM in Cardiff?
Silux Mobile offers some of the cheapest no-contract SIMs available in Cardiff — from £5/month on Three, Vodafone, EE and O2, on a 30-day rolling plan or a 3 to 24-month contract, with free Royal Mail Tracked 48 delivery to Cardiff.
Does Three have good coverage in Cardiff?
Yes. Three's 4G and 5G network covers Cardiff and the surrounding Cardiff area with strong indoor and outdoor signal. Check your exact postcode at siluxmobile.co.uk/network-coverage.
Can I get a no-contract SIM delivered to Cardiff?
Yes. Silux Mobile delivers to all Cardiff addresses free by Royal Mail Tracked 48 (2–3 working days). Faster delivery can be chosen at checkout.
Will my price increase mid-contract?
No. Silux Mobile never raises your price mid-contract — no annual or inflation-linked rises. The price you sign up at in Cardiff is the price you keep.
Do you run a credit check in Cardiff?
No. There are no credit checks on our SIM contracts, so anyone in Cardiff can join regardless of credit history.
Are prices in Cardiff inclusive of VAT?
Yes. No hidden fees — every price shown to customers in Cardiff is the price you pay, incl. VAT. No setup fees and no price increases.