How much mobile data do I need?

How much mobile data is enough? Quick comparison

These are shopping starting points rather than usage thresholds. A 30GB plan can sometimes cost less than a 20GB plan, so check neighbouring allowances, the same network and the full commitment—not just the price per gigabyte.

Unsure where to start? Try the DealPriceCheck Mobile Data Usage Calculator. Enter your real usage if you know it, or estimate how much data you use for video, browsing, calls and other activities while off Wi-Fi. It estimates usage and identifies the smallest listed GB tier that covers that estimate. That is not necessarily the best-value deal: an offer with a larger allowance may cost less, so compare the neighbouring categories before buying.

Find your actual monthly usage before buying

Your mobile provider's usage record is generally more useful than a generic description of a “light” or “heavy” user. Open your provider's app or account and note the last three complete billing periods. Look at the busiest month that reflects your normal routine, then allow for changes you know are coming.

This matters because many UK customers already pay for far more data than they use. In research published in February 2026, Ofcom found that 29% of pay-monthly mobile users consumed no more than 2GB a month, while 55% used 20% or less of their included allowance. That does not establish that everyone should buy a tiny plan: it is evidence that checking actual use can uncover unnecessary spending.

Check mobile data on an iPhone or Android phone

• iPhone: go to Settings → Mobile Data (or Cellular), then scroll to the app-by-app figures. The Current Period is not necessarily your bill month because the counter can be reset manually. Apple explains the distinction in its mobile data guidance. On dual-SIM phones, check which line provides mobile data.
• Google Pixel: go to Settings → Network & internet → SIMs → App data usage and choose a period. Google's Pixel data-usage guidance also covers warnings and limits. Menus vary on other Android devices.

Use the provider's figures when the phone's dates or counters differ from your billing period. Remember to count mobile data, not everything you watch or download while connected to Wi-Fi.

Two examples: why your busiest month matters

A fixed 20% or 30% buffer is not a universal rule. Think instead about your next commute, occasional home-broadband outages, holidays or new video habits. If your usage varies sharply and you cannot predict it, a suitable rolling SIM may let you learn your real needs without a long commitment. Check whether the quoted renewal is every 30 days or every calendar month when comparing payments over a year.

No usage history? Estimate the activities that use data

You do not need to calculate every message individually. Focus first on video quality, time spent away from Wi-Fi and hotspot use; these can dominate an otherwise light month. Our data calculator can combine activity estimates, but checking real usage after your first month is still worthwhile.

Netflix's published settings illustrate why an “hour of streaming” is not a fixed number. For its phone app on mobile data, Netflix lists:

Netflix also publishes different playback-quality settings used outside that mobile-data control: Low (up to 0.3GB/hour), Medium (up to 0.7GB/hour) and High in HD (up to 3GB/hour). Those figures can be useful if you stream on a tethered laptop or another device, but must not be confused with the phone app's Automatic/Save Data options. Source: Netflix's official data-usage guidance. These examples are estimates or potential maximums for Netflix, not universal rates for YouTube, TikTok or calls. Actual use changes with the device and settings.

An extra ten hours of video off Wi-Fi can matter more than an entire month of routine messaging. Equally, someone who streams hours of video on home Wi-Fi might need very little mobile data.

Which allowance should you choose in practice?

5GB–10GB: light use and a reliable Wi-Fi routine

Start here if you are connected to home or workplace Wi-Fi most of the day and use the mobile network mainly for maps, transport, messaging, music and occasional clips. 5GB has little room for surprises; 10GB adds flexibility if you spend more time out. If you are already near 10GB in a normal month, compare the next size rather than depending on turning every video off.

20GB–30GB: everyday use with some video

These are sensible comparisons when you regularly browse social apps, listen to music and watch some video on mobile data. If you normally use 8–12GB, 20GB may be a comfortable option, though a cheaper 10GB plan could also be enough if your peak is low. If you approach 20GB in a busy month, 30GB is worth checking. No brand or national average can tell you the right figure without your own routine.

50GB: frequent streaming or occasional hotspot sessions

Look at 50GB when long commutes, regular video or laptop tethering are part of a normal week. It is not automatically needed because you own a 5G phone or occasionally have a busy weekend. Compare the total price of 50GB with 100GB+ before paying for the difference.

100GB+ versus unlimited: sustained heavy use

Large allowances suit people who rely on mobile data for work, entertainment or occasional home internet. If your phone acts as a router, count the laptop, tablet and other connected devices too. Unlimited can be worth the extra payment when usage is consistently very high or difficult to predict. It is not automatically faster than a capped plan: some tariffs include speed restrictions or separate roaming and tethering conditions.

What about 5G, hotspot use and going abroad?

Does 5G use more data? Not for the same file at the same quality: downloading a 500MB file still transfers roughly 500MB on 4G or 5G. Faster connections can encourage more viewing or higher video quality, which can increase your overall usage. Choose by coverage, compatible handset and the actual plan, not by assuming 5G demands a huge allowance.

Does a hotspot use extra data? It uses the same mobile allowance, unless the tariff specifies different conditions. For regular remote work, measure a representative day of tethering, multiply by your expected working days, and add your normal phone use. Check provider restrictions before treating a mobile SIM as home broadband.

Can I use the full allowance in Europe? Not necessarily. UK data and roaming entitlements are different. A 100GB or unlimited UK tariff may allow only a smaller amount abroad or require a pass. Check destinations and overseas limits in our SIM deals with EU roaming comparison.

Turn your data estimate into a cheaper SIM-only deal

Once you know your peak usage or have a calculator estimate, choose in this order:

1. Check coverage: eliminate networks that do not work reliably at home, at work or on your usual journeys. Use Ofcom's Map Your Mobile for a postcode-level guide; its indoor predictions are not guarantees.
2. Compare neighbouring allowances: open the relevant GB comparison in the table above and the next allowance up. Compare plans on a network you can use, with compatible commitment and features; a smaller data label is not automatically cheaper.
3. Compare what you will actually pay: include any discounted initial bills, later recurring charges, known price rises, upfront costs and the cost of leaving early. Compare the same length of time rather than treating twelve 30-day renewals as twelve calendar months. Where an offer's contract total already includes stated increases, do not add them a second time.
4. Continue through the existing live offers: open Full plan details, then use the matching card's View Deal button. This retains the tariff-specific destination and tracking already used by DealPriceCheck.

Worked price comparison (hypothetical, not live offers): imagine a 20GB SIM at £8 for its first three 30-day renewals and £12 for the next three, versus a 30GB SIM at £10 for each of six renewals. The 20GB option costs £60 (3 × £8 + 3 × £12); the 30GB option also costs £60 (6 × £10). If both work on a suitable network and have comparable terms, the larger allowance provides more headroom at the same six-renewal cost. Check real promotions, fees and later prices on the live cards rather than assuming the advertised first payment lasts.

For someone whose usage may change, compare flexible and no-contract SIM deals before accepting a long commitment. This guide explains how much data to buy; the live category pages let you choose a current tariff.

If you specifically want to explore providers on EE's network after comparing our live cards, you can browse 1pMobile's SIM bundles or browse Lyca Mobile's SIM-only offers. Both use EE's underlying UK network, but the providers' terms, renewal arrangements, promotions and roaming may differ. These are additional contextual links, not replacements for the tracked tariff-specific View Deal routes in DealPriceCheck.

Quick questions about mobile data

Does Wi-Fi count towards my mobile allowance?

Normally no. But a phone can switch to mobile data when Wi-Fi disconnects, and Apple's Wi-Fi Assist may use mobile data when the Wi-Fi connection is weak. The phone's mobile-data and provider records show what was actually charged against your allowance.

What happens if I run out of data?

That depends on your SIM: traffic might stop, be slowed down, or require a paid add-on or out-of-bundle charge. Check the selected plan's rules before buying an allowance with very little headroom.

Should I get unlimited data if I cannot estimate my use?

Not automatically. Use the calculator, consider a short-commitment plan and review your usage after your first complete renewal period. Choose unlimited when its cost, coverage, speed and features genuinely suit your needs.

Editorial information reviewed on 21 October 2026. DealPriceCheck compares selected UK SIM offers, not the whole market; prices, availability and terms may change. Check the final provider terms before buying. Some links may earn DealPriceCheck commission at no extra cost to you.