Data SIM Cards in Caernarfon
Data-only SIM cards in Caernarfon from £4/month on Three's 5G network. Ideal for tablets, dongles, MiFi and routers.
Silux Mobile delivers data SIMs to Caernarfon and all of Gwynedd free by Royal Mail Tracked 48. Pure data, no calls or texts to pay for — on Three's 5G/4G network, on a 30-day rolling plan or a 3 to 24-month contract.
Why Caernarfon Chooses Silux Data SIMs
Delivered to Caernarfon
Free Royal Mail Tracked 48 delivery (2–3 working days) anywhere in the UK including Caernarfon and Gwynedd.
Three 5G in Caernarfon
Our SIMs use Three's 5G/4G network with strong coverage across Caernarfon 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
Data SIM Plans — Delivered to Caernarfon
Data-only SIMs on Three 5G. 30-day rolling or 3 to 24-month contracts.
Data Plus
30GB
£6/mo
- 30GB data
- Tablet & dongle ready
- 4G/5G
- 30-day or contract
Unlimited Data
Unlimited
£16/mo
- Unlimited data
- 5G speeds
- No throttling
- 30-day or contract
Three 5G Data Coverage in Caernarfon
Three's 5G/4G network covers Caernarfon and Gwynedd with strong signal for tablets, dongles and mobile routers. Over 99% UK population coverage.
Check Your Caernarfon PostcodeData SIM Cards in Caernarfon — FAQs
What happens if I go over the fair usage policy in Caernarfon?
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 data SIM in Caernarfon?
Silux Mobile offers some of the cheapest data SIMs available in Caernarfon — 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 Gwynedd.
Does Three have good coverage in Caernarfon?
Yes. Three's 4G and 5G network covers Caernarfon and the surrounding Gwynedd area with strong indoor and outdoor signal. Check your exact postcode at siluxmobile.co.uk/network-coverage.
Can I get a data SIM delivered to Caernarfon?
Yes. Silux Mobile delivers to all Caernarfon 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 Caernarfon is the price you keep.
Do you run a credit check in Caernarfon?
No. There are no credit checks on our SIM contracts, so anyone in Caernarfon can join regardless of credit history.
Are prices in Caernarfon inclusive of VAT?
Yes. No hidden fees — every price shown to customers in Caernarfon is the price you pay, incl. VAT. No setup fees and no price increases.