A 20GB data plan will allow you to browse the internet for about 200 hours, stream 10,000 songs, or watch 25 hours of standard-definition video.
Nowadays, the main distinction between mobile phone plans is how many gigabytes of data it comes with.
If you're looking for a mobile phone plan with 20GB of data, prices currently start from £6/month in the UK. With your 20GB of data, you'll be able to browse the internet for approximately 200 hours per month, to stream 10,000 songs online, or to watch 25 hours of online video in standard definition.
In this article, we'll discuss what you can do with 20GB of data and how long you can expect your 20GB allowance to last for. We'll also discuss 20GB data plans, where you can find one in the UK and how much you can expect to pay.
Contents
How Much Is 20GB Data?
In the UK, a number of mobile networks offer 20GB data plans. There's a choice of 6 mobile networks if you're looking for a Pay Monthly SIM card, and a further choice of 2 networks if you're looking for a Pay As You Go bundle.
Pay Monthly SIM Cards
If you're looking for the lowest possible prices, you can get a Pay Monthly SIM card with 20GB of data from £6.00/month. The following table shows a list of currently available deals:
| Network | Data | Monthly Cost | |
|---|---|---|---|
| 20GB data | £6.00 per month 1 month contract | See deal |
| 20GB data | £6.90 per month 1 month contract | See deal |
| 20GB data | £8.00 per month 1 month rolling | See deal |
| 20GB data | £10.00 per month 1 month rolling | See deal |
| 20GB data | £20.00 per month 24 month contract Monthly cost rising to £21.80 on 1 Apr 2026 | See deal |
| 20GB data | £21.00 per month 12 month contract Monthly cost rising to £22.80 on 1 Apr 2026 | See deal |
Contract lengths can vary on a Pay Monthly contract. You'll normally need to undergo a credit check when you take out a Pay Monthly contract.
Pay As You Go SIM Cards
If you're looking for more flexibility, a Pay As You Go bundle allows you to have this. You can get 20GB of data from £10.00/month on Pay As You Go. There's no commitment to renewing your bundle every month. You'll also be able to change your data allowance at the end of each month if you find you're on a plan with the wrong amount of data.
The following table shows Pay As You Go bundles with 20GB of data per month:
| Network | Data | Monthly Cost | |
|---|---|---|---|
| 20GB data | £10.00 per month No contract | See deal |
| 20GB data | £15.00 per month No contract | See deal |
Alternatives
Instead of choosing a 20GB data plan, it may sometimes make sense to choose a plan with more data. This is especially the case when special offers and promotion are available: you might be able to get a larger allowance of data for the same or for a very similar price:
| Amount of Data | Pay Monthly | Pay As You Go |
|---|---|---|
| 250MB Data | - | - |
| 500MB Data | - | - |
| 1GB Data | £2.90 £3 cheaper | £6.00 £4 cheaper |
| 2GB Data | £6.00 | £6.00 £4 cheaper |
| 3GB Data | £5.00 £1 cheaper | £5.00 £5 cheaper |
| 4GB Data | £6.00 | £7.50 £2.5 cheaper |
| 5GB Data | £4.50 £1.5 cheaper | £5.00 £5 cheaper |
| 6GB Data | £6.00 | £9.90 £0 cheaper |
| 8GB Data | £7.00 £1 more | £8.00 £2 cheaper |
| 10GB Data | £5.00 £1 cheaper | £8.00 £2 cheaper |
| 12GB Data | £6.00 | £10.00 |
| 20GB Data | £6.00 | £10.00 |
| 30GB Data | £8.00 £2 more | £15.00 £5 more |
| 40GB Data | £6.95 £1 more | £13.50 £3.5 more |
| 50GB Data | £7.95 £2 more | £12.50 £2.5 more |
| 100GB Data | £9.95 £4 more | £15.00 £5 more |
| Unlimited Data | £15.00 £9 more | £20.00 £10 more |
Some plans include a 'data rollover' feature that gives you a second opportunity to use your data allowance. Alternatively, an unlimited data plan could also be worth considering if you'd like a worry-free plan where you'll never run out of data.
How Long Does 20GB Of Data Last?
When figuring out how much data you need, it's important to think about your own individual usage requirements.
If you choose a plan with too much data, you could be overpaying for lots of data that you don't actually use. On the other hand, choosing a plan with too little data could mean being cut-off from the internet in the middle of the month.
The following table gives you an approximate guide to what you can do with 20GB of data:
| 20GB data is equal to... | |
|---|---|
| 25 hours of SD video streaming (50 minutes per day on YouTube, Netflix or TikTok) | |
| 6 hours 40 minutes of HD-quality video (15 minutes per day streaming HD video e.g. from Netflix) | |
| 25 hours of video calling (50 minutes per day on Zoom or Teams) | |
| 40 hours of social media scrolling (1 hour 20 minutes per day on Facebook, Instagram or X) | |
| 200 hours of web browsing (6 hours 40 minutes per day of browsing, approx 10,000 web pages) | |
| 500 hours of music streaming (17 hours per day on online radio & streaming apps like Spotify) | |
| Other Activities | |
| 100 mobile app downloads (standard app installs & updates, games may use more data) | |
| 6,600 photos uploaded or shared (on WhatsApp, or uploaded to the cloud e.g. iCloud & Google Photos) | |
| 7,000,000 text messages & emails (plain text messages, without attachments) | |
If you'd like to understand how different apps and activities contribute to your mobile data usage, see our guide to working out how much data you need.
As of 2024, the average UK mobile user consumes about 10GB of mobile data each month. This has grown fairly rapidly over the last few years (e.g. it was just 5.6GB per month in 2022, and 8.0GB per month in 2023). This means a 20GB data allowance should comfortably cover the average UK consumer's monthly data usage.
Data use calculations for 20GB data, by app & activity:
- SD Video Streaming (25 hours): We’ve used a figure of 800MB per hour for a standard-quality video stream. This is based on testing of the following apps: TikTok (800MB per hour), BBC iPlayer (800MB per hour), and Netflix (700MB per hour for medium quality video). Therefore, a 20GB data allowance will allow you to stream SD video for 25 hours in total, which is equivalent to 50 minutes per day.
- HD Video Streaming (6 hours 40 minutes): According to Netflix, you’ll need 3GB data per hour for a HD-quality video stream. Therefore, 20GB of data will allow you to stream 6 hours 40 minutes of HD-quality shows and movies, which is equivalent to 15 minutes per day.
- Video Calls (25 hours): You’ll need about 800MB data per hour for video calls on Zoom or Microsoft Team. Therefore, a 20GB data allowance will allow you to video call for 25 hours in total, which is equivalent to 50 minutes per day.
- Social Media (40 hours): Our testing found that social media apps (e.g. Facebook & Instagram) used about 40MB of data during a 5-minute session. Therefore, a 20GB data allowance will allow you to scroll through social media for 40 hours in total, which is equivalent to 1 hour 20 minutes per day.
- Web Browsing (200 hours, or 10,000 web pages): As of 2024, the average size of a mobile web page is 2.4MB. Therefore, you’d be able to open 10,000 web pages with 20GB of data. Assuming you browse continuously and open 40 web pages per hour, you’d be able to browse for 200 hours in total, which is equivalent to 6 hours 40 minutes per day.
- Music Streaming & Radio (500 hours, or 10,000 songs): At a typical bitrate of 96kbps, you’d be able to use your 20GB data allowance to listen to music or online radio for 500 hours in total (roughly 10,000 songs). This is equivalent to 17 hours per day.
- Photo Uploads (6,600 photos): Assuming you have a 12-megapixel photo with a file size of around 3MB, you’d be able to share or upload 6,600 photos using 20GB of data.
- Mobile Apps (100 app downloads): Assuming you have a typical iOS or Android mobile application with a download size of 200MB, you’d be able to download 100 apps using 20GB of data. Do note, however, that many mobile games will use more data (up to 3GB per game). For this reason, it’s best to install and update on your apps on Wi-Fi where possible.
- Text Messages & Emails (7,000,000 messages): Text-only messages (e.g. WhatsApp and plain-text emails) use very little data. In fact, you can send or receive 7,000,000 text-only messages with 20GB of data.
More Information
Our full guide to mobile download limits has more information, including how to work out how much data you need.
Once you've decided how much data you need, we've summarised the best Pay Monthly and Pay As You Go SIM cards across a variety of price points in the UK.
Mark said:
I enjoy the no worry of unlimited. I can easily read articles like this and get lost following all the branch off topics and then have no time left.
I would really be in a pinch if I used up all my data without concern, reading about duck wing feather mites in birds of the pine forested area of Kanuckistan or somewhere, and have no time left to read a bus schedule the next day.
The extra cost is worth it to me. Hell, I used 2gb just trying to read the comparison chart for 2gb.
Dre replied:
😂 😂
Angela said:
I just bought Pay As You Go card (it said £15 25GB on it, but I paid £1 for the card).
I then bought £10 top-up for it and put it on…… I was lazy and couldn’t be bothered to go downstairs to see what the internet code was and so went on to mobile data.
17 minutes later my £10 was used up.
This was my first experience with my new Smart Phone. I will be going back to my Samsung Flip phone which DOES only cost me £10 per month for unlimited calls and texts. I do NOT need internet and photos and all this malarkey – I was getting on just fine (Amazon is useful but if I remember to check when they will arrive I do not really need them).
This is daylight robbery by 3 (and no doubt other companies are similar). I am utterly shocked!
I don’t know what I did wrong, but I expect other people will have as well – what if I had been lost in a forest – 17 mins for £10 wouldn’t have been very long to get unlost and I may have been eaten by a wolf…….
Back to my happy-clappy phone!
Angela
Angela replied:
Another point from me – Angela – I only went on to Google and TESCO website to see if I could log on to the internet – don’t recall anything else, and I updated some settings on my new phone….. I didn’t upload or download anything or add any Word or Excel docs; I looked up the word ‘squirrel’ and I don’t think much else….
I am off to the 3G phone shop tomorrow, but for me – this was a bit like a horror movie!!
I am off to use my laptop now – modern technology I understand!
Angela (again). 🙂
Soundharrajan k replied:
Please refresh.my one GB plans
David Edwards said:
Why am I paying £16 for 12 GB by Three if I can get 30GB for roughly the same by Three. I want to listen to Audable books att night to help me sleep. I’ll be phoning them Monday to change my data allowance. I don’t have WiFi though so hope that’s not an issue as many talk as if we all have WiFi we all do not.
Thank you for your wise words.
Anthony replied:
I’ve been looking through the providers plans and some are shocking. EE charge £19 for 8GB yet Smarty charge about £6for 8GB. I had Voxi, £10.00 a month for 30GB but I just read they are now charging £2.00 a day for EU roaming, so I’ve just cancelled them and joined Smarty on their £12.00 a month for 100GB plan with free EU roaming, Smarty also do a good £10.00 a month deal. 100GB a month works out at 3.2GB per day, which is 6 hours of movies worth everyday, more than enough for me. I also have WiFi at home, so I’m going to just use mobile data exclusively for the next month and see exactly how much data I use and then choose a plan from there, I may only need 10GB along with my WiFi. We’ll see.