Look out forBlack Fridayin your results
Already have a phone you love? Switch to SIM only, compare every UK network plan in one place, no hidden fees.
Uses O2's network
Unlimited
5G data
£7.50first month
then £15 a monthNo contract
50% off month 1 with CodeYellowNovember50
Code runs 9 to 30 Nov 2026. Then £15 a month to month 5, £14 to month 11, £13 after. Checked 9 Nov 2026.
How we make money
Each price is as listed on the date shown. Full terms are on the provider's page.
from
£3.20a month
30GB data · 1-month rolling plan
Network offer: £3.20 a month for 6 months, then £8 a month
from
£2.80a month
15GB data · 1-month rolling plan
Network offer: £2.80 a month for 6 months, then £7 a month
from
£12.00a month
200GB data · 18-month contract
Network offer: 50GB + 150GB extra
from
£15.00a month
1000GB data · 1-month rolling plan
448 deals · from 10 retailers · Updated 6h ago
Network offer: 3 months Free Disney+
Network offer: £2.80 a month for 6 months, then £7 a month
Network offer: £3.20 a month for 6 months, then £8 a month
Showing 24 of 448 deals
The cheapest SIM only deal listed on SwitchSquid on 3 November 2026 is £1.00 a month for 1GB of data with Sky Mobile on a 24-month contract. We compare 448 SIM only deals.
Choose the contract length that matches how you use your phone and how much flexibility you need.
The most flexible option. Cancel with 30 days' notice at any time. Monthly prices are slightly higher than 12-month contracts, but you are never locked in. Best for people who travel often, are mid-way through paying off a handset, or simply want freedom to switch the moment a better deal appears.
The most popular choice. Prices are lower than rolling plans, and deals are fixed for a year so you know exactly what you are paying. Best for people who are happy with their current network and want the lowest monthly cost without a long commitment.
The cheapest per-month option, but you are tied in for two years. Some networks offer additional perks on 24-month plans, like extra data, inclusive roaming, and streaming subscriptions. Worth considering if you are very happy with your network and the saving is significant.
No contract at all. Top up when you need to and pay for what you use. Best for very light users, people travelling short-term in the UK, or children's first phones. Not usually the best value for regular users who need data every month.
There are four main mobile networks in the UK: EE, O2, Vodafone and Three. Smaller providers (called MVNOs) run on these same masts and often charge less. Here is a quick comparison:
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MVNOs use the same network infrastructure as their parent provider, so coverage is identical. The difference is price: MVNOs typically charge 20 to 40% less for similar data allowances because they have lower overheads.
Most people overestimate how much data they use, and pay for data they never touch. Check your actual usage before you compare: iPhone: go to Settings, then Mobile Data, then scroll down to see monthly data used. Android: go to Settings, then Network, then Data Usage.
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If you are frequently near the top of your allowance, go one tier up. Charges for exceeding your data allowance are expensive. Unlimited plans are often only a few pounds more than large data plans and remove the worry entirely.
You do not have to change your phone number when you switch networks. The process is simple and free:
Text INFO free to 85075 to confirm your contract status and whether any exit fees apply.
Text PAC free to 65075. You will receive your Porting Authorisation Code within 1 working day at no charge.
Use Switch to find your best SIM only deal. Select your new plan and complete the sign-up. No need to contact your current network.
Give your PAC code to the new network when signing up. Your number transfers automatically, usually within 1 working day. Your old contract cancels automatically. Important: do not cancel your old contract before getting your PAC code, you will lose your number permanently if you do.
Roaming rules vary significantly between networks since the UK left the EU. Some networks include roaming in certain plans; others charge a daily fee. If you travel regularly, check roaming terms before you sign up. Always check the current terms on the network's site as these can change.
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Most modern phones use a Nano SIM. Almost all networks send a 3-in-1 SIM (also called a multi-SIM or combi SIM) that includes all three sizes in one card, so you simply pop out the size you need. If you are not sure, check your phone's manual or the manufacturer's website.
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The biggest saving comes when your phone contract ends and you stay on the same plan without switching to SIM only. At that point you are still paying the full monthly price, including a handset you have already paid off. Moving to a SIM only plan removes that cost immediately.
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Switch compares hundreds of sim only deals uk from every major network and MVNO in one place. Enter your data needs, choose your contract length, and see the cheapest options listed on this page, ranked by total monthly cost, not commission.
The comparison is completely free. There is no obligation to switch. If you want help choosing, our team is available on 01926 942125.
Ask Squid AI. Tell it your budget and how you use your phone, and it'll show SIM-only plans from our live list that fit.
Squid AI can make mistakes, so check the deal page before you buy.
A phone contract bundles a handset and a SIM together. You pay a monthly amount that covers both the phone cost and the airtime. A SIM only deal is just the airtime: calls, texts and data. Because there is no handset to pay off, monthly prices are much lower.
Galaxy S26 Black Friday deals, checked 10 November 2026: unlimited iD data at £29.99 a month with £29 upfront, plus FE and Watch9 prices to compare.
Hey!Broadband Black Friday 2026: Gigafast 900 full fibre is £23 a month (was £43), with £100 switch credit. Compared with BT £33.99 and Gigaclear £29.
Is Black Friday broadband worth it? We add up 24-month costs with April rises: Virgin M350 at £21.99 works out at £26.32 a month, plus Gigaclear free months.
SMARTY Black Friday 2026: 50GB for £8 a month via the Affiliate Special, plus SMARTY’s own 80GB for £10 and 200GB for £15 offers, checked 10 November 2026.