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