How much data do you actually need for a 7-day trip?

Every guide to this question hands you the same table of hourly consumption and then leaves you to guess. We can do the last step for you, because we sell the plans: 47 seven-day options across 16 destinations, priced. So here is what each answer to "how much data do I need" actually costs — and where the estimate you are about to make goes wrong.

The short version: most seven-day leisure trips land between 4 and 10 GB. Not because travelers use little data, but because hotel WiFi absorbs the heaviest hours. The people who run out are rarely the heaviest users overall — they are the ones who took one two-hour video call on a 1 GB/day plan.

What each thing actually costs you

Published estimates, not measurements of your phone. They vary with app settings and quality, which is why the ranges are wide.

Read the last three rows against the first one. One hour of high-definition streaming costs roughly what 150 hours of turn-by-turn navigation costs. That single ratio explains most "I have no idea how I used 10 GB" stories.

Three travelers, three numbers

Notice how far apart the first and third rows are: roughly ten times. That is why an answer that starts with "average users need X" is useless — there is no average user. Your own pattern decides it, and there are two questions that pin it down.

The number that decides it is your worst day

On a daily plan, the allowance resets each morning and does not carry over. An unused 700 MB on Tuesday is gone; a heavy Wednesday cannot borrow it. So your average day is irrelevant. What matters is whether your heaviest day fits inside one day's tier.

Concretely: one hour of a one-to-one video call runs 300 MB to 1.5 GB depending on the app and quality, and a group call can reach 2.5 GB. On a 1 GB/day plan, a single meeting can push you to the reduced-speed floor for the rest of that day — usable for maps and messages, not for the next call. If video calls are part of your trip, the 1 GB tier is not a smaller version of the 5 GB tier. It is a different product that does not do that job.

Fixed-data plans behave the opposite way: the bucket is shared across the whole week, so a light day genuinely subsidises a heavy one. What you buy there is flexibility, and what you give up is the safety net — see daily vs fixed-data for what happens when each one runs out.

Now price it: the tier ladder

Seven-day plans on our own store, in HKD. Read the last column — it is the whole argument.

In every destination on this list, the jump from the middle tier to the top tier costs less per gigabyte than the jump from the bottom to the middle. In Japan, going from 7 GB to 14 GB costs HK$20; going from 14 GB to 35 GB costs HK$26 — that is 21 extra gigabytes for HK$1.24 each.

Which means the expensive mistake is not over-buying. It is estimating low. If your week is somewhere between "probably fine" and "not sure", the top tier is the cheap place to be wrong.

Your destination moves the price more than your habits do

A gigabyte in Hong Kong is HK$1.97. A gigabyte in Canada is HK$24.00. Same product, same company, twelve times apart — because what you are really buying is the wholesale rate your plan's local network charges the destination carrier.

The practical consequence is that the "how much do I need" question deserves a different amount of effort depending on where you are going:

• In Asia, stop optimising. The top tier gives you 35 GB for HK$69–118. You will not run out on a week-long holiday; the estimating exercise is worth less than the price of a coffee.
• In North America and the Gulf, estimate properly. Every gigabyte costs six to twelve times more, and only fixed-data plans are sold for these destinations — so running out means the connection stops, not slows. Here the tiers go 5 GB or 10 GB: in the US that is HK$62 or HK$108, so the second five gigabytes cost HK$9.20 each against HK$12.40 for the first five. Buy the bigger one.

Your "day" does not start at your midnight

This one is in the fine print of every plan we sell, and almost nobody accounts for it: the calendar day is counted in Hong Kong time (UTC+8), for all destinations. Your daily allowance does not reset at your local midnight. It resets at midnight in Hong Kong, whenever that happens to be where you are standing.

US, Canada and Mexico figures are for daylight-saving months; US and Canadian reset times move an hour earlier in winter. Mexico does not observe daylight saving.

Two practical bearings from this. If you fly west and switch the eSIM on when you land — morning in New York, say — your first "day" is already half gone, and it ends at noon. And the reverse: your final morning's data runs until noon local, not until you leave for the airport. Plan the heavy things for just after the reset, and expect a long-distance westbound trip to effectively lose part of a day at the start.

Related: plans activate on first connection and must be activated within 30 days of purchase — so buying a few weeks ahead is safe. See the FAQ for the rest of the setup basics.

Three things that blow up estimates

1. Laptop tethering. A tethered laptop does not know it is on a metered connection unless you tell it. Operating-system updates, cloud drives and browser tabs will happily pull 2–4 GB through a two-hour work session. Turn off auto-updates on cellular before you tether.
2. Cloud backup of full-resolution photos. 3–5 MB per photo sounds harmless until a hundred of them upload overnight. Set photo backup to WiFi-only while you travel.
3. Video, in any form. This is the one line item that can consume a week's allowance in an evening. Download what you want to watch before you go, or keep it on hotel WiFi.

Get your own number instead of guessing

Your phone already knows the answer. On iPhone: Settings → Cellular (or Mobile Data), scroll to the bottom and read the current period total. On Android: Settings → Network & internet → SIMs → Data usage. Divide by the number of days, then correct it in two directions: subtract the video you normally stream at home on WiFi, and add the navigation and translation you never use at home. Reset the counters on day one of your trip and you will have an exact number for next time.

Quick answers

Is 5 GB enough for a week?
For a city trip with hotel WiFi in the evening, yes — typical use is 4 to 7 GB. For remote work with daily video calls, no: 5 GB is roughly two days.

What if I use less than I bought?
On a daily plan, each day's unused allowance simply expires that night. On a fixed-data plan the unused data stays available for the whole validity period — but it is not refundable, so estimate slightly low rather than a lot high.

What happens if I run out?
On a daily plan: speeds drop to 256 kbps and you stay connected — fine for maps, messaging and email, not for video. On a fixed-data plan: the connection is cut off. If being offline would be a real problem, that difference is the strongest argument for a daily plan.

Should I buy 7 days if my trip is 5 days?
No. Per-day pricing is close to flat, so you are paying for days you will not use: Japan at 5 GB/day is HK$73 for 5 days and HK$101 for 7. Buy the length of the trip.

Is the Unlimited tier worth it?
In Hong Kong, 7 days unlimited is HK$85 against HK$69 for 5 GB/day. In Japan it is HK$121 against HK$101. If your usage is genuinely unpredictable, or video calls are on the schedule, that gap buys you the right to stop estimating.