Getting a new phone on a contract is the easy option, but paying for that phone upfront and getting a SIM-only contract makes much better financial sense. Our round-up of the best SIM deals in the UK could save you a fortune.
It's worth noting that, even if you choose to opt for a SIM-only deal that requires switching to a new network, you don't need to lose your number.)
Here, we've picked out our favourite SIM-only deals to help you discover the best deals quickly and easily.
For light use: Our favourite SIM deal for light data users is the iD 1GB data, 500 minutes, unlimited texts, 4G - £5 per month. View deal here.
For moderate use: LIMITED TIME DEAL: iD, 3GB data, 500 minutes, unlimited texts, 4G - £8 per month. View deal here.
For heavy use: LIMITED TIME DEAL: Three, 30GB data, unlimited minutes, unlimited texts, 4G - £18 per month. View deal here.
If you're looking for more advice on how to choose a contract, or want to see some more of the top contracts picked out by our editors for light users, moderate users, heavy users and tablet users, click here. Otherwise, use our comparison tool below for SIM deals tailored to your needs.
If you're studying at the moment, also check out our article on the best phone contracts for students.
Students should also see our dedicated Tech Advisor student deals page. There, Three Mobile currently has 12-month SIM deals starting as low as £11 per month for 4GB of data, up to £28 per month for 100GB of data – all with unlimited texts and calls. Similarly, network newcomer Smarty has a SIM deal with 2GB of data with unlimited text and calls for £7.50 per month.
Compare all SIM deals
Here, you can use our SIM deals comparison tool to help you find a contract that suits you. Use the sliders and drop down menus to adjust your preferences and see which networks offer a contract that'll suit you and your budget. If you're on mobile and can't see the comparison tool below, click here to refresh for an optimised version of the page.
Unlike smartphone contracts, which typically stretch to 24 months, SIM-only deals are much shorter. Most SIM-only deals come with 12-month contracts, but you can also get rolling monthly contracts – sometimes at the same price or just a few pounds more expensive – that are ideal for visitors to the UK.
The price you pay per month will largely depend on how many minutes and texts you need, and how much data you require.
Plus, you'll need to decide whether your SIM is to go in a tablet (in which case you'll only need data) or a smartphone (in which case you'll want minutes, texts and data).
It's worth noting that most operators don't allow you to simply take your SIM out of your smartphone in a tablet. They also often frown upon tethering.
Pinning down the best SIM-only contract is tricky due to the huge number of combinations of minutes, texts and data available.
However, most people will fall into one of three camps that we'll focus on here: those who simply want to make the odd call or text, and use their PC to go online; those who make calls and texts, go online, check emails, use apps and perhaps watch the odd video; and those who are permanently glued to their smartphone.
Or, to put that more simply, light-, moderate- and heavy users.
SIM deals for light use
There are plans available for just £5 per month if you plan on using your SIM for light use.
We'd recommend considering iD, which is Carphone Warehouse's mobile network. All of iD's contracts offer bill capping, data rollover and Roam like at Home making it an even more appealing option with no nasty surprises.
A good option for light users is its 1 GB option, which is just £5 per month:
- iD: 1GB data, 500 minutes, unlimited texts, 4G - £5 per month. View deal here.
SIM deals for moderate use
Our favourite moderate use deal is from iD, which offers 3GB data, 500 minutes and unlimited texts for an incredible £8 per month.
- LIMITED TIME DEAL: iD: 3GB data, 500 minutes, unlimited texts, 4G - £8 per month. View deal here.
iD also offers a 6GB or 8GB plan for £12.50 or £15 respectively here.
New iD rival, also offering exclusively SIM-only contracts, is SMARTY. It's powered by Three and offers three options: Small, Medium or Large. The Large option matches iD's 8GB at £15, and is available here.
SIM deals for heavy use
For anyone who wants the freedom to text and use the internet as much as they like, our favourite deal is Three's 30GB data, unlimited texts and unlimited minutes contract, which is a very reasonable £18 per month.
- LIMITED TIME DEAL: Three, 30GB data, unlimited minutes, unlimited texts, 4G - £18 per month. View deal here.
Three also offers a 12GB option for £15. View deal here.
Tablet plans (Data SIMs)
You can't simply take the SIM out of your phone and stick it in your tablet. You need to get a SIM that uses a data-only plan (and don't forget that not all tablets offer SIM-card slots, in which case you'll only be able to connect to WiFi).
How much data you need will very much depend on the activities you intend to enjoy on your tablet, plus whether you spend any of your time within range of a Wi-Fi hotspot. If you want a SIM just to cover you on the odd occasion that you use your tablet away from home and need to continue to access your email, you certainly don't need to pay out extra for a 4G plan.
Some of the best SIM-only deals for tablets come from Three, which offers 1GB for £7.50 per month, 2GB for £8 per month, 20GB for £15 per month. You can view those deals here.