SIM Only Plans in Windsor
SIM only plans in Windsor from £5/month on Three's 5G — data-only, unlimited and multi-network options.
Silux Mobile is a SIM only provider serving Windsor and all of Berkshire. SIMs are available on Three, Vodafone, EE and O2, on a 30-day rolling plan or a 3 to 24-month contract, with no credit check and free Royal Mail Tracked 48 delivery.
Why Windsor Chooses Silux Mobile
Delivered to Windsor
Free Royal Mail Tracked 48 delivery (2–3 working days) anywhere in the UK including Windsor and Berkshire.
Three 5G in Windsor
Our SIMs use Three's 5G/4G network with strong coverage across Windsor 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
SIM Only Plans — Delivered to Windsor
On Three 5G. 30-day rolling or 3 to 24-month contracts.
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 Windsor
Three's 5G/4G network covers Windsor and Berkshire with strong indoor and outdoor signal — over 99% UK population coverage.
Check Your Windsor PostcodeSIM Only in Windsor — FAQs
What happens if I go over the fair usage policy in Windsor?
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 SIM in Windsor?
Silux Mobile offers some of the cheapest SIMs available in Windsor — 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 Berkshire.
Does Three have good coverage in Windsor?
Yes. Three's 4G and 5G network covers Windsor and the surrounding Berkshire area with strong indoor and outdoor signal. Check your exact postcode at siluxmobile.co.uk/network-coverage.
Can I get a SIM delivered to Windsor?
Yes. Silux Mobile delivers to all Windsor 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 Windsor is the price you keep.
Do you run a credit check in Windsor?
No. There are no credit checks on our SIM contracts, so anyone in Windsor can join regardless of credit history.
Are prices in Windsor inclusive of VAT?
Yes. No hidden fees — every price shown to customers in Windsor is the price you pay, incl. VAT. No setup fees and no price increases.