Compare the best SIM-only deals

Best SIM-only deals icon

Happy with the phone you've got? Need a SIM to go with it? We've tracked down our pick of the best on offer right now.

Today's best SIM-only deals

Provider Data Amount Contract Length Monthly Costs
Three sim only 8GB data 12 months £9.00
Tesco Mobile sim only 10GB data 12 months £13.00
  • Three sim only
    4G
    • 8GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • £9.00 per month
    12 month contract From Three Mobile
  • Tesco Mobile sim only
    4G
    • 10GB of 4G data
    • 5000 minutes
    • 5000 texts
    • £13.00 per month
    12 month contract From Tesco Mobile

In the table above, you'll find our selection of the best SIMs on offer right now.

Handpicked by our panel of experts, we've selected these deals chiefly because they offer generous allowances for a good price.

However, we might also have chosen to bring them to your attention because the SIMs will get you excellent coverage and speeds.

Or because we think they come with attractive incentives, such as free gifts or loyalty schemes.

Best SIM deals by network

Network logos

Want the network with the best speeds and coverage? Maybe free BT Sport or Amazon Video is more important to you?

Or perhaps a network that lets you roll over unused data is what you're really looking for?

To help you get the network and SIM that best suited to your needs, we've outlined the main networks' key selling points below.

Best EE SIM only deals this week

Provider Data Amount Contract Length Monthly Costs
EE sim only 1GB data 12 months £16.00
EE sim only 20GB data 12 months £26.00
EE sim only 40GB data 12 months £32.00
  • EE sim only
    4G
    • 1GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • £16.00 per month
    12 month contract From EE Mobile
  • EE sim only
    4G
    • 20GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • £26.00 per month
    12 month contract From EE Mobile
  • EE sim only
    4G
    • 40GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • £32.00 per month
    12 month contract From EE Mobile

If speeds and coverage are your main criteria, EE should be top of your list. But as you might expect you'll pay a bit extra for the superior service.

EE incentives aren't the very best around, but still compare well with the competition.

Smart contracts, for instance, allow you to change your customer benefits from month to month, from a selection that includes free BT Sport.

Or you can choose to extend the roaming area in which you can use your UK allowances for no extra charge.

Best Vodafone SIM only deals this week

Provider Data Amount Contract Length Monthly Costs
Vodafone sim only 8GB data 12 months £10.00
Vodafone sim only 20GB data 12 months £20.00
Vodafone sim only 20GB data 12 months £20.00
  • Vodafone sim only
    4G
    • 8GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • 5GB data bonus
    • £10.00 per month
    12 month contract From Vodafone
  • Vodafone sim only
    5G
    • 20GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • £20.00 per month
    12 month contract From Vodafone
  • Vodafone sim only
    5G
    • 20GB of 5G data
    • Unlimited minutes
    • Unlimited texts
    • £20.00 per month
    12 month contract From Vodafone

Like EE, Vodafone stands out for good coverage and speeds. But just like EE, its SIMs aren't the cheapest.

The extra outlay can get you welcome customer incentives, though, with select contracts offering a 12-month subscription to your choice of Sky Sports Mobile, Spotify, Amazon Video or Now TV.

Vodafone's other major selling point is an extensive roaming scheme. Depending on the plan you choose, you'll be able to use your UK allowances in 48 or 77 locations for no extra charge.

All customers get free gifts and money-off promotions with Vodafone's VeryMe scheme.

Best Tesco Mobile SIM only deals

Provider Data Amount Contract Length Monthly Costs
Tesco Mobile sim only 10GB data 12 months £13.00
Tesco Mobile sim only 50GB data 12 months £25.00
  • Tesco Mobile sim only
    4G
    • 10GB of 4G data
    • 5000 minutes
    • 5000 texts
    • £13.00 per month
    12 month contract From Tesco Mobile
  • Tesco Mobile sim only
    4G
    • 50GB of 4G data
    • 5000 minutes
    • 5000 texts
    • £25.00 per month
    12 month contract From Tesco Mobile

Tesco Mobile's key selling point is that you'll get Clubcard points every time you pay your monthly phone bill. These are paid at a rate of one point for every pound you spend.

It also offers capped contracts, so you can keep tabs on how much you're spending, and inclusive roaming in 31 locations.

Best O2 SIM only deals

Provider Data Amount Contract Length Monthly Costs
O2 sim only 1GB data 12 months £10.00
O2 sim only 10GB data 18 months £15.00
  • O2 sim only
    4G
    • 1GB of 4G data
    • 1000 minutes
    • Unlimited texts
    • £10.00 per month
    12 month contract From O2
  • O2 sim only
    4G
    • 10GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • £15.00 per month
    18 month contract From O2

O2's award-winning 4G service offers extensive coverage. But its network is generally rated as slower than the likes of EE, Vodafone and Three.

Its customer rewards are very good, however. All plans include O2's Rewards scheme, which gets you money-off promotions and giveaways.

And you get O2 Priority too, which means you're in line for priority booking for events at O2 venues.

O2 also scores highly for its network of 150,000 WiFi hotspots, allowing you to make WiFi calls in areas with a weak signal.

Best Three SIM only deals

Provider Data Amount Contract Length Monthly Costs
Three sim only 2GB data 12 months £6.00
Three sim only 8GB data 12 months £9.00
  • Three sim only
    4G
    • 2GB of 4G data
    • 200 minutes
    • Unlimited texts
    • £6.00 per month
    12 month contract From Three Mobile
  • Three sim only
    4G
    • 8GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • £9.00 per month
    12 month contract From Three Mobile

The breadth of Three's roaming scheme is one of the network's main selling points.

Sign up for an Advanced Plan and you'll be able to use your UK allowances in 71 locations. Cheaper Essential plans get you roaming in 48 locations, which is still significantly more than most other networks.

Three's customer rewards scheme isn't as extensive as O2 and Vodafone's. But you still get giveaways and discounts at high-street stories and restaurants with its Wuntu app.

Best iD Mobile SIM only deals

Provider Data Amount Contract Length Monthly Costs
ID sim only 7GB data 1 month £9.00
ID sim only 20GB data 1 month £14.00
  • ID sim only
    4G
    • Exclusive
    • 7GB of 4G data
    • 500 minutes
    • Unlimited texts
    • Free Data Rollover
    • £9.00 per month
    1 month contract From iD Mobile
  • ID sim only
    4G
    • Exclusive
    • 20GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Includes a £14 prepaid Mastercard - Free data rollover
    • £14.00 per month
    1 month contract From iD Mobile

iD Mobile SIMs stand out for being very keenly priced. You can typically get an iD SIM with enough data for light users for not much more than £5 per month.

iD Mobile's service is based on O2's network. That means that, just like O2, coverage is very good. But while speeds are fine, it's not the fastest network around.

All plans feature inclusive roaming in 50 locations and the option to rollover unused data from month to month.

Best VOXI SIM only deals

Provider Data Amount Contract Length Monthly Costs
VOXI sim only 6GB data 1 month £10.00
VOXI sim only 15GB data 1 month £15.00
VOXI sim only 45GB data 1 month £20.00
  • VOXI sim only
    4G
    • 6GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Unlimited social data
    • £10.00 per month
    1 month contract From VOXI
  • VOXI sim only
    4G
    • 15GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Unlimited social data
    • £15.00 per month
    1 month contract From VOXI
  • VOXI sim only
    4G
    • 45GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Unlimited social data
    • £20.00 per month
    1 month contract From VOXI

VOXI's unique selling point is that all customers can use social networking sites as much as they like without eating into their data allowance.

Its roaming scheme, where you can use your UK allowances for no extra charge, takes in 48 locations, and customers can use their monthly allowance for tethering too.

Best BT Mobile SIM only deals

BT Mobile offers existing broadband customers £5 per month discount when they sign up to a SIM only deal. Which makes its SIMs pretty attractive, if that applies to you.

BT Mobile also offers free access to five million WiFi hotspots, as well as inclusive roaming in 47 destinations.

All plans allow you to add more SIMs to save money as part of a family plan. And select BT plans come with free BT Sport, with live coverage of Premier League games, Aviva Premiership Rugby and more.

Best giffgaff SIM only deals

Provider Data Amount Contract Length Monthly Costs
GiffGaff sim only 10GB data 1 month £12.00
GiffGaff sim only 40GB data 1 month £20.00
GiffGaff sim only Unlimited data 1 month £25.00
  • GiffGaff sim only
    4G
    • 10GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • £12.00 per month
    1 month contract From giffgaff
  • GiffGaff sim only
    4G
    • 40GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • £20.00 per month
    1 month contract From giffgaff
  • GiffGaff sim only
    4G
    • Unlimited 4G data
    • Unlimited minutes
    • Unlimited texts
    • Speed restrictions apply after 40GB of data use
    • £25.00 per month
    1 month contract From giffgaff

giffgaff's got a lot to recommend it.

Not least very competitively priced SIMs that get you very attractive allowances for your monthly outlay and good coverage, courtesy of the O2 network on which giffgaff's service is based.

Its no-contract plans are also simple and flexible, allowing you to easily change your allowances from month to month.

However, largely because giffgaff is a cheaper network, it doesn't offer the same sort of perks you get with the likes of O2 and Three.

For instance, inclusive roaming is restricted to the EU on all plans. And there's no conventional customer support either.

If you've got a problem or query, you'll need to head to giffgaff's customer forums, where its community of users field questions and help out.

Best Plusnet Mobile SIM only deals

Provider Data Amount Contract Length Monthly Costs
Plusnet Mobile sim only 2GB data 1 month £6.50
Plusnet Mobile sim only 6GB data 1 month £9.00
Plusnet Mobile sim only 20GB data 1 month £20.00
  • Plusnet Mobile sim only
    4G
    • 2GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Roam like at home
    • £6.50 per month
    1 month contract From Plusnet Mobile
  • Plusnet Mobile sim only
    4G
    • 6GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Roam like at home
    • £9.00 per month
    1 month contract From Plusnet Mobile
  • Plusnet Mobile sim only
    4G
    • 20GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Roam like at home
    • £20.00 per month
    1 month contract From Plusnet Mobile

Plusnet Mobile's service is based on EE's network. So although it's a 'value' network, you'll get very good speeds and coverage.

Unlike BT Mobile, you don't get a discount on a Plusnet Mobile SIM if you're a Plusnet broadband customer. However, you do get extra data, calls and texts.

Plusnet Mobile's Roam Like Home roaming scheme takes in over 40 EU destinations, which is in line with other comparably priced networks.

Unlimited data SIM only deals

Provider Data Amount Contract Length Monthly Costs
GiffGaff sim only Unlimited data 1 month £25.00
SMARTY sim only Unlimited data 1 month £22.00
  • GiffGaff sim only
    4G
    • Unlimited 4G data
    • Unlimited minutes
    • Unlimited texts
    • Speed restrictions apply after 40GB of data use
    • £25.00 per month
    1 month contract From giffgaff
  • SMARTY sim only
    4G
    • Unlimited 4G data
    • Unlimited minutes
    • Unlimited texts
    • £22.00 per month
    1 month contract From SMARTY

Stream a lot of video on your commute? Download a lot of movies, especially in HD or 4K? Or maybe you play a lot of online games?

If the answer's 'yes', you should seriously consider a SIM with an unlimited download allowance.

Not every network offers unlimited data. But you've got plenty of options, including Three, Vodafone and Smarty.

If the network you'd like to join doesn't offer unlimited data SIMs, you should still be able to get a SIM with a high data allowance that'll get you enough to cover your heavy mobile internet usage.

Best 30-day SIM-only deals

Provider Data Amount Contract Length Monthly Costs
VOXI sim only 6GB data 1 month £10.00
ID sim only 20GB data 1 month £14.00
GiffGaff sim only 40GB data 1 month £20.00
Lebara Mobile sim only 3GB data 1 month £6.99
SMARTY sim only 4GB data 1 month £10.00
  • VOXI sim only
    4G
    • 6GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Unlimited social data
    • £10.00 per month
    1 month contract From VOXI
  • ID sim only
    4G
    • Exclusive
    • 20GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Includes a £14 prepaid Mastercard - Free data rollover
    • £14.00 per month
    1 month contract From iD Mobile
  • GiffGaff sim only
    4G
    • 40GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • £20.00 per month
    1 month contract From giffgaff
  • Lebara Mobile sim only
    4G
    • Exclusive
    • 3GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • 100 international minutes to over 40 countries
    • £6.99 per month
    1 month contract From Lebara Mobile
  • SMARTY sim only
    4G
    • 4GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Discount on unused data
    • £10.00 per month
    1 month contract From SMARTY

Prefer a one-month SIM deal that you can alter or cancel whenever you like? You've got a lot of choice. Networks that offer 30-day deals on SIMs include…

It's particularly easy to change your allowance on networks that are technically PAYG, such as Asda Mobile, giffgaff, and Lebara Mobile - take a look at those if you really value flexibility.

Bear in mind that some networks don't extend some customer benefits to one-month plans, so you may not get access to all the same incentives and rewards that you would on a long-term contract.

That's not universal, though - many still let you use things like tethering, extended roaming, and perks like O2 Priority.

Learn more about how to find the best 30-day SIM deal here.

Cheap SIM-only deals

Provider Data Amount Contract Length Monthly Costs
VOXI sim only 6GB data 1 month £10.00
GiffGaff sim only 10GB data 1 month £12.00
Plusnet Mobile sim only 2GB data 1 month £6.50
Tesco Mobile sim only 15GB data 12 months £15.00
Vodafone sim only 5GB data 12 months £8.00
Sky Mobile sim only 3GB data 12 months £6.00
  • VOXI sim only
    4G
    • 6GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Unlimited social data
    • £10.00 per month
    1 month contract From VOXI
  • GiffGaff sim only
    4G
    • 10GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • £12.00 per month
    1 month contract From giffgaff
  • Plusnet Mobile sim only
    4G
    • 2GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Roam like at home
    • £6.50 per month
    1 month contract From Plusnet Mobile
  • Tesco Mobile sim only
    4G
    • 15GB of 4G data
    • 5000 minutes
    • 5000 texts
    • £15.00 per month
    12 month contract From Tesco Mobile
  • Vodafone sim only
    4G
    • 5GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Includes 4GB data bonus
    • £8.00 per month
    12 month contract From Vodafone
  • Sky Mobile sim only
    4G
    • 3GB of 4G data
    • Unlimited minutes
    • Unlimited texts
    • Unlimited streaming for Sky TV customers
    • £6.00 per month
    12 month contract From Sky Mobile

Find the cheapest SIM-only deals by sorting our comparison table by cost. Use the toggle in the top right, and all the lowest-priced SIMs will be shown at the top of the table.

You can also set a maximum price that you'd be willing to pay each month in the sidebar filters, and take a look at everything available in your budget.

For cheap SIM plans, try small networks that specialise in low prices, such as:

Best SIM-only deals for iPhone

SIM cards from all networks will work in iPhones, as long as you get the right size:

  • iPhone 5, 6, 7, 8, 9, X, XS and XR - nano SIM
  • iPhone 4 or 4S - micro SIM
  • Original iPhone, 3, or 3G - standard SIM

As for allowance, newer iPhone models and Plus versions will probably need a little more data than average, especially if you're upgrading.

It means you'll probably use your phone more, and web pages will load quicker, resulting in more data usage - and viewing video on such a big screen requires a bit more data too.

Some networks even have bonus extras that you can make use of. Vodafone and Three, for instance, have options for streaming video more cheaply.

Best SIM-only deals for Samsung Galaxy

Provider Data Amount Contract Length Monthly Costs
GiffGaff sim only Unlimited data 1 month £25.00
SMARTY sim only Unlimited data 1 month £22.00
  • GiffGaff sim only
    4G
    • Unlimited 4G data
    • Unlimited minutes
    • Unlimited texts
    • Speed restrictions apply after 40GB of data use
    • £25.00 per month
    1 month contract From giffgaff
  • SMARTY sim only
    4G
    • Unlimited 4G data
    • Unlimited minutes
    • Unlimited texts
    • £22.00 per month
    1 month contract From SMARTY

As with iPhones, if you want to get the best of your handset you'll need a decent data allowance for a Samsung Galaxy phone.

It'll let you use all your apps, and there's enough data to handle fast processing speeds, high-res video streaming, and uploading quality photos to social media.

Again, you can get a SIM for your Samsung from any network, provided you select the right size SIM card:

  • Samsung Galaxy S6, S7, S8, S9, S10 - nano SIM
  • Samsung Galaxy S5, S4, S3 - micro SIM
  • Samsung Galaxy Note 5, 7, 8, 9 and 10 - nano SIM
  • Samsung Galaxy A phones - nano SIM

How to find a good SIM only deal

The very best SIM deal of all, of course, is the one that gives you everything you want from a plan at the lowest possible cost.

Adjust the filters at the side of the comparison table to just show the sort of deals you want, then sort them by cost with the selector at the top.

Here are a few things to think about when navigating the table and choosing a deal…

Allowance

There's a huge spread on offer here - you can get pretty much any allowance you like.

SIM tariffs range from the tiny (100MB data, plus a few hundred minutes and texts) to the huge (unlimited everything). Check out our guide for more info on working out how much data allowance you need.

Network

You have plenty of networks to choose from for SIM deals too. Some are nice and cheap, others are packed with benefits, and you may even be able to snag a special deal from your current mobile network or broadband / TV provider.

Either way, make sure you check coverage in your area before you commit to a deal.

Contract length

Long-term SIM deals are usually cheaper over the year than one-month SIMs - while short-term deals have the advantage of letting you chop and change your plan whenever you want.

Can I keep my phone number if I switch network?

Yes, you can keep your current mobile number if you switch to a SIM on a different network.

In fact, it's easy - there's no reason at all to stick with the same network if you can get a better SIM deal elsewhere.

To get a new deal and keep your number, simply sign up to the deal, then contact your current network for a PAC (porting authorisation code) number.

Once your new SIM arrives and you've activated it, contact your new network and give them the PAC.

Just make sure you do so within 30 days of receiving the code, or it'll expire.

Once the porting is underway, your phone number should transfer over to your new SIM card within a few days.

Compare SIM-free phones

if you'd rather avoid a long-term mobile contract, you can always go for a SIM-free phone deal... otherwise known as a handset-only deal.