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Unlimited data SIM only deals

If you don’t want any restrictions on the amount of data you use with your mobile phone, an unlimited data SIM only deal is the way to go. Most UK networks now offer unlimited data deals to suit a range of budgets.

Sponsored
iD Mobile
iD Mobile SIM deal
Unlimiteddata
£15per month
Uswitch Black Friday exclusive
3 months' Free Apple TV+
Free roaming up to 30GB
Sponsored byiD Mobile
See deal
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List of SIM Only deals

  1. SMARTY logo

    SMARTY SIM deal

    Promoted

    Uses Three's network

    Uses Three's network

    Contract length
    No contract
    Contract length
    No contract
    • EU roaming included
    • No 2023 price rise
    • Black Friday deal
    Unlimited5G data
    £15.00per month
    Buy now
  2. Lebara Mobile logo

    Lebara Mobile SIM deal

    Promoted

    Uses Vodafone's network

    Uses Vodafone's network

    Contract length
    No contract
    Contract length
    No contract
    • EU roaming included
    • No 2023 price rise
    • Uswitch Black Friday exclusive
    Unlimited5G data
    £9.98for 4 months £24.95 after
    Buy now
  3. Lyca Mobile logo

    Lyca Mobile SIM deal

    Promoted

    Uses EE's network

    Uses EE's network

    Contract length
    No contract
    Contract length
    No contract
    • EU roaming included
    • No 2023 price rise
    • Uswitch Black Friday exclusive
    Unlimited5G data
    £8.99for 3 months £24.45 after
    Buy now
  4. Talkmobile logo

    Talkmobile SIM deal

    Promoted

    Uses Vodafone's network

    Uses Vodafone's network

    Contract length
    1 month
    Contract length
    1 month
    • EU roaming included
    • No 2023 price rise
    Unlimited5G data
    £16.00per month
    Buy now
  5. Vodafone logo

    Vodafone SIM deal

    Promoted

    Contract length
    12 months
    Contract length
    12 months
    • VeryMe Rewards app
    Unlimited5G data
    £34.00per month
    Buy now
  6. iD Mobile logo

    iD Mobile SIM deal

    Uses Three's network

    Uses Three's network

    Contract length
    1 month
    Contract length
    1 month
    • 3 months' Free Apple TV+
    • Free roaming up to 30GB
    • Uswitch Black Friday exclusive
    Unlimited5G data
    £15.00per month
    Buy now
  7. iD Mobile logo

    iD Mobile SIM deal

    Uses Three's network

    Uses Three's network

    Contract length
    12 months
    Contract length
    12 months
    • 3 months' Free Apple TV+
    • Free roaming up to 30GB
    • Black Friday deal
    Unlimited5G data
    £15.00per month
    Buy now
  8. giffgaff logo

    giffgaff SIM deal

    Uses O2's network

    Uses O2's network

    Contract length
    No contract
    Contract length
    No contract
    • Flexible plans
    • No 2023 price rise
    Unlimited5G data
    £35.00per month
    Buy now
  9. Three Mobile logo

    Three Mobile SIM deal

    Contract length
    24 months
    Contract length
    24 months
      Unlimited5G data
      £20.00per month
      Buy now
    • Asda Mobile logo

      Asda Mobile SIM deal

      Uses Vodafone's network

      Uses Vodafone's network

      Contract length
      1 month
      Contract length
      1 month
      • EU roaming included
      Unlimited5G data
      £20.00per month
      Buy now
    • Three Mobile logo

      Three Mobile SIM deal

      Contract length
      12 months
      Contract length
      12 months
        Unlimited5G data
        £21.00per month
        Buy now
      • Vodafone logo

        Vodafone SIM deal

        Contract length
        12 months
        Contract length
        12 months
        • VeryMe Rewards app
        Unlimiteddata
        £31.00per month
        Buy now
      • Honest mobile logo

        Honest mobile SIM deal

        Uses Three's network

        Uses Three's network

        Contract length
        12 months
        Contract length
        12 months
        • Uswitch exclusive
        Unlimited5G data
        £11.25for 3 months £22.50 after
        Buy now
      • Honest mobile logo

        Honest mobile SIM deal

        Uses Three's network

        Uses Three's network

        Contract length
        No contract
        Contract length
        No contract
          Unlimited5G data
          £12.50for 2 months £25.00 after
          Buy now
        • VOXI logo

          VOXI SIM deal

          Uses Vodafone's network

          Uses Vodafone's network

          Contract length
          No contract
          Contract length
          No contract
            Unlimited5G data
            £30.00per month
            Buy now
          • giffgaff logo

            giffgaff SIM deal

            Uses O2's network

            Uses O2's network

            Contract length
            18 months
            Contract length
            18 months
            • No 2023 price rise
            Unlimited5G data
            £35.00per month
            Buy now
          • Asda Mobile logo

            Asda Mobile SIM deal

            Uses Vodafone's network

            Uses Vodafone's network

            Contract length
            1 month
            Contract length
            1 month
            • EU roaming included
            Unlimited5G data
            £24.00per month
            Buy now
          • Three Mobile logo

            Three Mobile SIM deal

            Contract length
            1 month
            Contract length
            1 month
              Unlimited5G data
              £30.00per month
              Buy now
            • Vodafone logo

              Vodafone SIM deal

              Contract length
              12 months
              Contract length
              12 months
              • VeryMe Rewards app
              Unlimited5G data
              £42.00per month
              Buy now
            • Vodafone logo

              Vodafone SIM deal

              Contract length
              12 months
              Contract length
              12 months
              • VeryMe Rewards app
              Unlimited5G data
              £41.00per month
              Buy now
            Can't find what you're looking for?

            Uswitch services are provided at no cost to you, but we may receive a commission from the companies we refer you to. If a deal is "promoted" on Uswitch's tables, then it has been lent additional visibility as a result of us securing exclusivity on a great deal, or a commercial agreement to showcase what we believe to be market-leading value to consumers. Learn more about how our site works.

            Please note: Mobile networks may increase monthly prices in line with the retail or consumer price index each year during the length of your contract. Please refer to individual network's terms and conditions before signing up.

            What is unlimited data?

            As the name suggests, Unlimited data SIMs give you unlimited access to the internet on your mobile device. That means you’ll never run out of data to surf the web, browse social media and stream content. Unlimited data also means you’ll never have to deal with surprise charges in your bills.

            Unlimited data deals generally cost more than those with a cap on the amount of data you get. But the upside is, there will never be a moment when you have to worry about running out of data. You’ll be able to stream, upload, download, chat and message as much as you want.

            How to get cheap unlimited data deals?

            Unlimited data SIM only deals usually cost more than deals with a set amount of data. But you can still find a deal that suits your budget by comparing offers from all the major networks, such as Vodafone, EE, O2, Three, and more.

            What are the benefits of unlimited data deals?

            The main benefit of an unlimited data deal is never running out of mobile data. So, even if you’re miles away from a Wi-Fi connection, you won’t have to worry about using lots of data on streaming a show or running an online playlist all day. It’s the best way to ensure you always have data when you need it.

            Alternatives to unlimited SIM only plans

            If you don’t want to go for an unlimited data SIM only deal but still require a lot of data, you can simply opt for a plan that caps your limit at a high number, like 100-200GB. Most networks provide deals with extremely high data caps, so compare SIM only deals on Uswitch today to find a price plan that suits your needs.

            Other SIM only deals include pay as you go SIMs, 12 month SIM deals, no credit check SIMs, iPhone SIM deals, 30-day SIM deals and 5G SIM deals.

            Is there a data cap?

            There’s no data cap on an unlimited data SIM only deal. You’re free to use as much mobile data as you like on your smartphone. There may be an instance where a fair usage policy is applied, but this will come down to individual networks. So check the fine print of your deal before you commit. But generally, unlimited means unlimited.

            Is there a limit to the amount of data I can download?

            Most unlimited data SIM only deals will not have any restrictions and you’ll be able to download as much data as you want. Some networks may include a fair usage policy. But even if that’s the case, it won’t kick in after you’ve used more than enough data for most consumers. Check with your network to see what their specific policy is.

            Which providers offer unlimited data deals?

            You can get an unlimited data SIM only deal on most major UK networks.

            Here’s a quick look at some of the extras you can get:

            Vodafone

            With Vodafone you can add up to three "Xtra benefits" to your unlimited plan, including romaing in up to 83 destinations. You can also add entertainment subscriptions – such as Spotify Premium, YouTube Premium and Amazon Prime – for as little as £8 a month.

            You can also get unlimited 5G SIM only data plans at three different speed levels, similar to a broadband package.

            Three

            Three’s SIM only unlimited data deals are attractively priced and can be picked up on 30-day rolling or 12-month contracts. They’re all 5G-ready as standard too, with no caps or fair usage policy.

            giffgaff

            Choose giffgaff’s ‘golden goodybag’ add-on to get unlimited 5G data and free international roaming (although this has a 20GB per month cap limit).

            Tesco Mobile

            Tesco Mobile’s unlimited SIM only offerings are competitively priced. And since Tesco Mobile runs on O2’s network, you’ll enjoy 99% 4G coverage across the UK, as well as 5G coverage in a wide range of locations.

            O2

            O2’s unlimited data SIM only price plans begin at around £30 a month and can include exciting extras like discounts on Amazon Prime and Disney Plus. You’ll also enjoy 5G as standard with no speed restrictions.

            And O2 is so far one of the only major UK networks that hasn’t reintroduced roaming charges in the EU. So you’ll be able to use your O2 data while travelling to EU countries.

            Smarty

            Smarty offers an unlimited SIM only data plan on a monthly rolling contract. There are no tethering restrictions and you don’t need to pass a credit check.

            Will I lose service if I switch to a SIM only deal with another network?

            No, you won’t lose any service by switching networks to a new SIM only deal.

            How easy is it to switch networks?

            Switching networks on a SIM only deal is incredibly easy thanks to Text to Switch. All you need to do is text PAC to 65075 to receive your PAC code. You then give this to your new network who’ll be able to port over your current phone number. As long as you’re out of contract, you don’t even need to speak to your old network.

            FAQs

            Is unlimited data really unlimited?

            Yes, in most cases unlimited means unlimited - so no data cap at all. Some networks may operate with a fair usage policy, so check before you sign up if that’s something you’re not sure of.

            Does unlimited data mean unlimited hotspot?

            Different networks will have different policies on using your unlimited data for hotspot, so check their terms and conditions before you commit to a plan.

            If I have unlimited data do I need wifi?

            No, with an unlimited data SIM only deal you’ll never need to log into wi-fi if you don’t want to. However, there may be occasions where a wi-fi connection is faster than mobile data so where you turn wi-fi on in some scenarios is up to you.

            Can I use my unlimited data SIM abroad?

            Different networks will have different policies on using your unlimited data abroad. Check up on your network’s roaming policy before you travel to be sure.

            Can I get unlimited 5G data?

            Yes, most networks now include 5G as standard with their SIM only deals, including on unlimited data plans.

            What can I do with my old SIM?

            If you have an old SIM card you no longer use, you can simply throw it away when you get your new unlimited data SIM.

            Are unlimited data sims more expensive?

            Yes, unlimited data SIM only deals will usually be more expensive than a deal that comes with a data cap. However, that doesn’t mean you can’t shop around to find a suitably priced deal for your budget.