A 100GB data plan will allow you to browse the internet for around 1200 hours, to stream 20,000 songs or to watch 200 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 100GB of data, prices currently start from £17/month in the UK. With your 100GB of data, you'll be able to browse the internet for approximately 1200 hours per month, to stream 20,000 songs online or to watch 200 hours of online video in standard definition.

In this article, we'll discuss what you can do with 100GB of data and how long you can expect your 100GB allowance to last for. We'll also discuss 100GB data plans, where you can find one in the UK and how much you can expect to pay.

How Much Is 100GB Data?

In the UK, a number of mobile networks currently offer 100GB data plans. There's a choice of 4 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 100GB of data from £17.00/month. The following table shows a list of currently available deals:

1 month
18 months
12 months
12 months
BT MobileUnlimitedUnlimited100GB£35.00
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 100GB 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 100GB 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£4.00 £13 cheaper£5.00 £5 more
500MB Data£5.00 £12 cheaper£5.00 £5 more
1GB Data£5.00 £12 cheaper£7.50 £7.5 more
2GB Data£6.00 £11 cheaper£7.00 £7 more
3GB Data£7.00 £10 cheaper£10.00 £10 more
4GB Data£8.00 £9 cheaper£10.00 £10 more
6GB Data£10.00 £7 cheaper£10.00 £10 more
8GB Data£8.00 £9 cheaper£10.00 £10 more
12GB Data£12.00 £5 cheaper£20.00 £20 more
20GB Data£14.00 £3 cheaper£15.00 £15 more
40GB Data£20.00 £3 more£20.00 £20 more
100GB Data£17.00-
Unlimited Data£18.00 £1 more£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 100GB 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 100GB of data:

Activity100GB data is equal to...
Accessing web pages60,000 web pages (approx 1200 hours browsing)
Basic e-mail/instant message35,000,000 messages
Rich e-mail/IM (with attachments)200,000 messages
Downloading or streaming music20,000 songs
Downloading or streaming video (SD)200 hours
Downloading or streaming video (HD)50 hours
Skype voice call3000 hours
Skype video call400 hours
Listening to online radio1600 hours
Downloading or updating apps2500 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 100GB 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.

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