A 40GB data plan will allow you to browse the internet for around 480 hours, to stream 8,000 songs or to watch 80 hours of standard-definition video.

Nowadays, the key difference between mobile phone price plans is how many gigabytes of data it comes with.

If you're looking for a mobile phone plan with 40GB of data, prices currently start from £25/month in the UK. With your 40GB of data, you'll be able to browse the internet for approximately 480 hours per month, to stream 8,000 songs online or to watch 80 hours of online video in standard definition.

In this article, we'll discuss what you can do with 40GB of data and how long you can expect your 40GB allowance to last for. We'll also discuss 40GB data plans, where you can find one in the UK and how much you can expect to pay.

How Much Is 40GB Data?

In the UK, a number of mobile networks currently offer 40GB data plans. There's a choice of 3 mobile networks if you're looking for a Pay Monthly SIM card. Unfortunately, no Pay As You Go options are current available.

Pay Monthly SIM Cards

If you're looking for the lowest possible prices, you can get a Pay Monthly SIM card with 40GB of data from £25.00/month. The following table shows a list of currently available deals:

12 months
BT MobileUnlimitedUnlimited40GB£25.00
12 months
24 months
12 months
To show you the most relevant plans, 1 similar but more expensive plans have been hidden. .

Contract lengths will vary when taking a Pay Monthly contract. You'll normally need to undergo a credit check when taking out a Pay Monthly contract.

Pay As You Go SIM Cards

If you're looking for a bit of extra flexibility, a Pay As You Go bundle allows you to have this.

Unfortunately, there are no Pay As You Go bundles available at present with 40GB of data per month in the UK. However, other options with a different amount of data will be available, including a selection of unlimited data plans.

Please see our full guide to Pay As You Go bundles for more information.


Instead of choosing a 40GB 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 DataPay MonthlyPay As You Go
250MB Data£13.00 £12 cheaper£5.00 £5 more
500MB Data£6.00 £19 cheaper£5.00 £5 more
1GB Data£5.00 £20 cheaper£7.50 £7.5 more
2GB Data£5.00 £20 cheaper£5.00 £5 more
3GB Data£7.00 £18 cheaper£10.00 £10 more
4GB Data£7.00 £18 cheaper£10.00 £10 more
6GB Data£10.00 £15 cheaper£10.00 £10 more
8GB Data£8.00 £17 cheaper£15.00 £15 more
12GB Data£10.00 £15 cheaper£20.00 £20 more
20GB Data£12.00 £13 cheaper£20.00 £20 more
40GB Data£25.00-
100GB Data£18.00 £7 cheaper£20.00 £20 more
Unlimited Data£18.00 £7 cheaper£25.00 £25 more

Some price plans include a data rollover feature giving you a second opportunity to use your data allowance. Alternatively, an unlimited data plan could also be worth thinking about if you'd like a worry-free plan where you never need to think about how much data you're using.

How Long Does 40GB 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 40GB of data:

Activity40GB data is equal to...
Accessing web pages24,000 web pages (approx 480 hours browsing)
Basic e-mail/instant message14,000,000 messages
Rich e-mail/IM (with attachments)80,000 messages
Downloading or streaming music8,000 songs
Downloading or streaming video (SD)80 hours
Downloading or streaming video (HD)20 hours
Skype voice call1200 hours
Skype video call160 hours
Listening to online radio640 hours
Downloading or updating apps1000 apps

We've made a number of assumptions in coming to these numbers. You can read about these in more detail here.

As of 2019, the average UK consumer uses around 3GB of mobile data each month. This has been growing rapidly in the past few years (e.g. it was only 1.9GB in 2017 and 0.2GB in 2012). This means a 40GB data allowance is much more than the average consumer can use. It's worth double-checking to make sure you actually need all of this data, as you could otherwise end up paying for lots of data that you don't actually use.

For more information, see our guide on how to find out your current data usage.

More Information

Our full guide to mobile download limits has more information including on how to find 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.

Your Comments 417 so far

We'd love to hear your thoughts and any questions you may have. So far, we've received 417 comments from readers. You can add your own comment here.

  • Carole Gough said:

    Thanks so much – I had no idea of how much 2gb of data would give me – so this was really helpful and sounds just what I need for a work phone. Thanks again for helping me with the decision.

  • Kohl Mahoney said:

    Thank you! I just hit 100gb of data (I don’t have internet and am always on my phone). Thankfully I have unlimited data.

  • Thank you for breaking that down. You are a God send. My gosh though, signing up for phone service shouldn’t be as complicated as shopping for a car; don’t you think? Ridiculous. Thank you for making it easier though.

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