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How much mobile data do you need? Start with the cellular data your phone actually used in several recent billing cycles, then adjust for upcoming changes such as more streaming, travel or hotspot use. Choose an allowance that covers a normal month with some room for variation, and check what your plan does if you reach its limit. There is no single monthly GB figure that fits everyone.
What “mobile data” means when choosing an allowance
Your mobile data allowance is the amount of internet data your phone can use each month while it is not connected to Wi-Fi. That is the definition in Ofcom’s UK consumer guidance, Choosing the right mobile package, published 25 August 2026. For estimating an allowance, count cellular use—not all internet activity across your home and mobile connections.
Activities that can use cellular data include web browsing, social media, maps, music or film streaming, and video calls. The amount depends on how you use each service. In particular, streaming video can consume data quickly, and higher-quality video can require more than lower-quality playback. The app, settings, compression, caching, device configuration and network connection all affect actual use, so activity estimates are guides rather than guaranteed rates.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsThat distinction matters when you read usage figures. A national total, an online calculator’s estimate and your own carrier’s billing record answer different questions. Your carrier’s records are the most useful starting point for your own plan decision because they reflect your cellular use under your circumstances.
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How to estimate your monthly use from actual records
- Open your carrier’s app or account page. Find the usage section and record cellular data for several recent billing cycles. If the account separates mobile data from Wi-Fi activity, use the cellular figure. Ofcom recommends checking the provider’s app or website for monthly usage.
- Compare full billing periods. Note the amount used in each month rather than relying on a single total or a partial current month. Write down the billing dates too, so you are comparing equivalent periods.
- Mark unusual months. Beside each figure, note meaningful changes: a trip, a longer commute, more time away from Wi-Fi, extra video streaming, or hotspot tethering. A one-off spike should not automatically become your permanent monthly target; recurring behavior should be included.
- Choose a representative baseline. Use the months that best resemble your expected routine. If your schedule changes seasonally or you travel regularly, include a month that reflects that pattern rather than treating the quietest month as typical.
- Add only planned changes. Estimate the additional cellular use you expect from a new habit, such as watching more video during a commute or connecting a laptop through your phone. Keep this adjustment separate from your past usage so you can see what is measured and what is forecast.
- Compare the adjusted estimate with plan terms. Look at the monthly allowance and what happens at the threshold, then decide how much room for ordinary variation you want. The best-fit allowance is not necessarily the smallest one that matches an average month.
If your carrier’s record is available only as a monthly total, use that as the baseline rather than trying to reconstruct every app’s traffic. If you have no usable history, track cellular use through a representative billing period before making a long commitment, if your current plan allows you to do so. A travel-heavy or unusually Wi-Fi-heavy period may not represent your future routine.
Which activities are most likely to change the estimate?
Begin with video and hotspot use because they can materially alter the kind of month you need to cover. Then consider social feeds, music, maps, browsing and video calls according to how often you use them away from Wi-Fi. The estimates below are reference points, not a promise of what any specific app or phone will consume.
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| Activity estimate | Published figure | Scope and limitation |
|---|---|---|
| 4K video streaming | 97.5 MB per minute | Rate displayed by AT&T’s data calculator, accessed 13 October 2026. Treat it as that calculator’s illustrative estimate, not a universal rate for every service, codec or stream. |
| Social media without video | 90 MB per hour | ComReg’s 2024 forecast for Ireland cites this as an estimate from its source material; it is not a universal measured rate. |
| Social video in the style of Instagram or TikTok | 180 MB per hour | ComReg’s 2024 Ireland forecast estimate. Actual use can differ by app and settings. |
| Spotify music | Approximately 115 MB per hour | Estimate cited in ComReg’s 2024 forecast for Ireland; it should not be read as a guaranteed rate for every listening setting. |
To turn a rate into a rough scenario, multiply the displayed rate by the time you expect to spend on that activity using cellular data, then convert the result to the units your plan uses. For example, the AT&T calculator’s 97.5 MB-per-minute estimate can illustrate why even a short period of 4K streaming may matter; it does not establish what another service or quality setting will use. Do not add a calculator estimate to your carrier’s total as if both measured the same thing: use the calculator to model a change in habits, while treating your carrier history as the baseline.
For each activity, ask whether it will happen on cellular or Wi-Fi. A video watched at home on Wi-Fi is not part of the cellular allowance estimate; the same video watched on a train may be. Offline downloads and cached content may also change how much data is transferred while away from Wi-Fi, so use your own settings and records where possible.
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How much data is enough for light, moderate or heavy use?
These labels are useful only as descriptions of habits, not as fixed monthly GB categories. A person who browses and checks maps mostly on Wi-Fi may need much less than someone who streams video daily away from Wi-Fi. Two people with similar routines may also differ because of video quality or how their apps handle content.
- Mostly Wi-Fi use: Your cellular need is driven by the periods you are away from Wi-Fi. Review ordinary travel, errands and workdays rather than counting all household internet use.
- Regular mobile media: Include time spent streaming music, browsing social feeds or watching video on cellular. Distinguish social use without video from video-heavy use when estimating.
- Frequent high-quality video or hotspot use: Give these activities explicit attention in your estimate. Ofcom says higher allowances may suit people who use their phones a lot away from Wi-Fi, particularly when streaming HD video.
Ofcom’s guidance says package options often start between 1 GB and 10 GB a month for light users. That is UK consumer guidance, not a universal recommendation or a guarantee that an allowance in that range will fit a particular person. Use your own records and expected routine to make the decision.
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How to choose between capped and “unlimited” plans
An allowance is only one part of the plan. Compare the cost over the full contract, the network’s coverage and likely performance where you use your phone, the included monthly data, restrictions after a threshold, and roaming terms. Ofcom recommends checking coverage and performance at the places you go, not just choosing by allowance. An advertised unlimited plan may also have speed, fair-use or travel restrictions, so read the terms that apply to your use.
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| Plan question | What to check | Why it affects the choice |
|---|---|---|
| Is the allowance sufficient? | Compare the monthly allowance with your adjusted typical use and the room you want for variation. | A plan that only covers a low-use month may be inconvenient if your normal routine changes. |
| What will it cost overall? | Check the total cost across the contract and any relevant add-ons, not just the headline monthly amount. | A larger allowance is not worthwhile if the added cost does not match your actual need. |
| Will service work where you need it? | Review coverage and expected performance at home, work and regular travel locations. | A large allowance is of limited value where coverage or performance does not suit your routine. |
| What happens at a data threshold? | Read the plan’s overage, speed-reduction, service-stop and fair-use terms. | Providers may handle reaching an allowance in different ways. |
| What about travel? | Check roaming limits and what applies in the countries you visit. | Domestic allowance wording may not describe the data available while roaming. |
The Federal Communications Commission’s 2024 order, FCC 24-136, describes several possible provider responses when a customer exceeds a data allowance: slower speeds for the remainder of the billing period, overage charges or service stopping for that period. These are possible policies, not a description of every plan. Check the terms for the specific plan and market you are considering.
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What national data-use figures can—and cannot—tell you
Ofcom reported that UK mobile data use exceeded 1.2 billion GB per month in 2025, an 18% increase year over year, while 5G data use grew 53%. Those are national usage totals and growth measures from Ofcom’s 19 November 2025 report, Brits devour data at record levels as mobile networks race to improve 5G. They are not per-person averages and do not establish a recommended allowance for an individual. Use them as context for growing network-wide use, not as a personal target.
Quick Recap
Common estimation mistakes to avoid
- Using total internet use instead of cellular use: Wi-Fi activity does not consume the mobile allowance in the way cellular activity does. Keep the two separate when records permit.
- Copying someone else’s number: A friend’s usage may reflect different Wi-Fi access, video settings, travel or tethering. Your own billing history is a stronger baseline.
- Treating an illustrative rate as a guarantee: The figures from AT&T and ComReg have specific source and context qualifications. Apps, quality, compression, caching and device settings can change actual usage.
- Choosing from one unusual month: Investigate why that month was high or low. Carry a spike into the estimate only if the activity is likely to recur.
- Looking only at the allowance: A plan’s total contract cost, coverage, post-threshold behavior and roaming restrictions can be as important as the monthly GB figure.
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