We compare the deals and what you can expect from each network, along with expert advice on how to choose an unlimited data SIM.
UK networks with unlimited data SIMs
You can now get unlimited data from most UK networks:
- BT Mobile (with BT Halo option selected)
- iD Mobile
- Superdrug Mobile
- Virgin Mobile
Best unlimited data SIM-only deals right now
Below we've ranked providers by price and current deals. We've also flagged providers that have 5G connectivity:
1. SIM: Three Unlimited Data
Now: £22 per month (£11 first 6 months)
You can often find the most competitive unlimited data SIM-O deals from Three. Currently it's running a promotion on a 24-month contract that halves the rate for the first six months to £11.
Pros: ✔50% off first 6 months ✔5G-ready ✔Tethering ✔Global roaming ✔Go Binge
Cons: ✘ 24-month contract ✘ Go Binge available on cheaper non-unlimited plans
2. SIM: Vodafone Unlimited Lite (2Mbps)
Now: From £22 per month (£11 first 6 months)
Vodafone is mirroring Three's 50% off 6 months offer on its 24-month unlimited plans. If you opt for an entertainment plan, you also get a 12-month subscription to either Amazon Prime Video, Spotify, Now TV or Sky Sports for free. Use its Network Status Checker tool to see Vodafone's coverage in your area.
Pros: ✔50% off first 6 months ✔5G-ready ✔Entertainment plans include choice of streaming service for free ✔Tethering ✔30-day terms available
Cons: ✘24-month contract ✘Speed restrictions on cheaper unlimited plans
3. SIM: Smarty Unlimited Data
Was: £20 per month
Now: £18 per month (for 12 months)
Smarty's unlimited data plan comes at a palatable cost of £20 per month, and is now reduces to £18 per month.
It's not on contract, so you can stick to the package for as long or as little as you want. There are no speed restrictions either. Smarty operates off of Three's network and you can use its tool to check your coverage.
You get up to 20GB at no additional cost if you're abroad in the EU. There is a usage cap of 1000GB generally, which prevents commercial use of the SIM (which Smarty doesn't allow).
Pros: ✔Not on contract ✔No speed restrictions ✔Tethering ✔EU roaming ✔No credit check
Cons: ✘4G only ✘20GB data limit abroad
4. SIM: Superdrug Mobile Unlimited Data
From: Superdrug Mobile
Now: £20 per month
At £20 per month, it's one of the cheapest unlimited data plans around. It's not on contract so you can cancel any time. Plus, Superdrug points card holders can double their Health & Beautycard points when shopping. Superdrug also operates off Three's network – you can check your coverage here.
Pros: ✔Not on contract ✔No credit check ✔Tethering ✔Includes EU roaming ✔Double Health & Beautycard points ✔£20 worth of Health & Beautycard points on joining
Cons: ✘4G only
5. SIM: Lebara Unlimited Data
Was: £35 per month
Now: £25 first month (£10 off the first month)
Lebera is the only provider that offers unlimited long distance minutes. See the full details of this plan.
6. SIM: iD Unlimited Data
From: iD Mobile
Was: £25 per month
Now: £20 per month (£5 off per month)
iD Mobile, belonging to Carphone Warehouse, offers its unlimited data SIM-O plan on a 30-day rolling contract, which is great if you prefer flexibility. The SIMs also include EU roaming, so you can use your data at no additional cost while abroad. See iD mobile's coverage
Pros: ✔Not on contract ✔Tethering ✔EU roaming
Cons: ✘4G only ✘Credit check
7. Unlimited Data SIM: BT
Now: £30 per month (to BT Halo customers)
BT's unlimited data plan is available for £30 per month if you are already on BT Halo unlimited highspeed broadband. It's not the most cost-effective if all you're after is an unlimited SIM, but might make sense to families already with BT at home, looking to upgrade.
Pros: ✔5G-ready ✔Tethering ✔Includes BT Sport ✔No capping in the UK ✔EU Roaming
Cons: ✘Available only to BT Halo customer ✘Capping at 50GB in EU ✘More expensive than other options
8. Unlimited data SIM: GiffGaff
Now: £25 per month
GiffGaff operates off O2's network and offers 4G connectivity – check your coverage. You can earn points when you refer other people to the service, which you can then convert into cash, credit or a donation to a charity.
Pros: ✔Tethering ✔No contracts ✔EU Roaming
Cons: ✘4G only ✘Caps at 80GB of data at high speed, then reduces to 38Mbps from 8am to midnight ✘20GB data limit abroad, 0.36p/MB charge thereafter
9. Unlimited Data SIM: Virgin
From: Virgin Media
Now: £32 per month
Virgin Media offers unlimited data for £32 per month, but you have to be a TV or broadband customer. Check your coverage.
Pros: ✔ Tethering ✔Uncapped messaging on WhatsApp, Twitter and Facebook without eating data ✔No speed throttling (average download speeds are 37Mbps) ✔EU roaming
Cons: ✘4G only ✘12-month contract minimum ✘available only to existing broadband or phone users ✘13.75GB data limit abroad
10. Unlimited data SIM: EE
Now: From £34 per month
EE's unlimited data SIM-only plans start from £34 per month, which is again on the steeper side when networks like Three and Vodafone are in the £20-range. The speeds are up to 60Mbps though, which may justify it for some.
Pros: ✔EU Roaming ✔Tethering ✔Speeds up to 60Mbps ✔£60 worth of in-game extras in Harry Potter: Wizards Unite ✔Free Apple Music for 6 months ✔5G option available for £44 with Swappable Benefits
Cons: ✘12-month contract ✘4G only
11. Unlimited Data SIM: O2
Now: £35 per month (with Disney Plus free for 6 months)
O2 offers unlimited data SIM deals for 4G and 5G connectivity – and they're both priced at £35 per month. Check your coverage with O2
Pros: ✔Roaming, including in the US ✔ Free 6 months of Amazon Prime Video, Amazon Music Unlimited, Audible, Cafeyn, Calm, or MelodyVR ✔Share data with joint accounts
Cons: ✘More expensive ✘15GB data capping abroad
12. Unlimited data SIM: Voxi
Now: £35 per month (with uncapped social media)
Voxi, owned by Vodafone is on the pricier side but you do get the benefit of not being tied to a contract while still getting 5G connectivity.
Pros: ✔5G ✔Tethering ✔No contract ✔Uncapped social media ✔No additional roaming costs (data capped at 25GB) ✔£20 Amazon gift card incentive if you sign up a friend
Cons: ✘More expensive than other unlimited offers
How to choose an unlimited data SIM?
Sure, the idea of unbridled mobile internet access sounds great, but there are a few things to think about before you sign on which could save you money in the long run. To start...
How do you use your data? First off, think of where you would use your data allowance the most. If you mostly stream video or music, or use social media, you may not necessarily need a totally unlimited plan.
Certain providers offer uncapped data on specific social media and streaming apps, so don't fork out where you don't need to! (On the topic of saving, there's also this ridiculously good SIM-O offer with 60GB data for £8 per month)
For instance, Three's Go Binge feature allows unlimited use of Snapchat, Netflix, TVPlayer, Dave, Deezer, SoundCloud and Apple Music without eating into the data allowance – but you can get Go Binge on a plan as low as £14 per month with 12GB data too. So unless you're always on YouTube, you could effectively get away with unlimited data where it matters but on the cheap.
Similarly, EE has its Swappable Benefits, which lets customers choose uncapped access to a select services at no extra data cost. The Video Data Pass, for example, lets you access Netflix, YouTube, BBC iPlayer, BT Sport and Amazon Prime Video without cutting into your data allowance.
There's also the Gamer's Data Pass which allows unlimited access to Pokemon Go, Harry Potter: Wizards Unite, FIFA and Star Wars Galaxy of Heroes. It also covers uncapped live streaming from Twitch.
Not all plans are equal - Some plans have a speed caps on its unlimited plans. Vodafone for instance offers its unlimited plans on different speed tiers.
Vodafone's Unlimited Lite is its cheapest plan, at £22 per month but £11 the first 6 months, but you only get 2Mbps – which won't be very handy if you often stream HD videos. Its standard Unlimited plan operates at 10Mbps maximum, while its Unlimited Max plan has no speed restrictions.
Can you qualify for unlimited plans with your broadband provider? You may be eligible for an unlimited SIM through your broadband provider.
Check your coverage. The last thing you want to be stuck with is a shoddy, slow connection. Most networks offer coverage checker tools on their sites (we've linked to them wherever possible in our chart above).