Daily plan vs fixed-data eSIM: which is cheaper for your trip?

Most travelers compare eSIM plans by looking at the price tag and the big number printed next to it. That is exactly how you end up paying twice what you needed to — because the two plan types sold for the same destination are not variations of each other. They are two different pricing models, and which one is cheaper depends on how long you stay and how much you actually use.

Here is the comparison with real prices. All figures are in HKD and come from our own China plans, which is the one destination where we sell both types — so the comparison is like-for-like, same network, same provider.

The two types, side by side

	Daily plan	Fixed-data (total) plan
How data is metered	A fresh allowance every day	One pool for the whole trip
Unused data	Does not carry over — gone at the end of the day	Stays in the pool until it is used
When you run out	Speed drops to 256 kbps, connection stays on	Connection is cut off
What you pay for	Days × daily tier	Total data tier, valid for a long period
Typical validity	1–7 days on most destinations, up to 30 days on some	30 to 365 days
Best for	Short trips with steady, heavier use	Longer trips, or lighter use

The difference nobody mentions: what happens when you run out

This is the part that decides whether a bad estimate costs you speed or costs you your connection.

Daily plan: once the day's high-speed allowance is used, speeds drop to 256 kbps and the connection stays on. That is slow, but it is not dead — maps, messages, email and ride-hailing all still work. You always have a floor.

Fixed-data plan: once the total allowance is used up, the connection is cut off. There is no reduced-speed fallback. If it happens on your last day, you are offline until you buy another plan.

So a daily plan is the safer buy when losing connection at the wrong moment would ruin your day. A fixed-data plan is the better value when you know your usage and can keep an eye on it. To watch it, check your phone: Settings > Cellular on iPhone, or Settings > Connections > Data usage on Android, shows what the eSIM has used this period.

Why the two price curves behave differently

The whole explanation takes ten seconds:

• A daily plan costs days × tier. It climbs in a straight line with trip length.
• A fixed-data plan costs whatever its total-data tier costs, and its validity is long. Adding days costs nothing.

Two lines, two directions. On a short trip the fixed-data plan is carrying a fixed cost you cannot spread out — you are paying for 30 days of validity to use three. On a long trip, the daily plan's straight line climbs past it.

The same trip, priced both ways

Real prices, our China plans. "Needed" is the total data for the whole trip.

3-day trip

Data needed	Cheapest daily plan	Cheapest fixed-data plan	Cheaper
4 GB	HK$36  (3 days × 2 GB/day)	HK$40  (5 GB / 30 days)	Daily — saves HK$4
8 GB	HK$45  (3 days × 5 GB/day)	HK$62  (10 GB / 30 days)	Daily — saves HK$17 (27%)

5-day trip

Data needed	Cheapest daily plan	Cheapest fixed-data plan	Cheaper
6 GB	HK$58  (5 days × 2 GB/day)	HK$62  (10 GB / 30 days)	Daily — saves HK$4
12 GB	HK$73  (5 days × 5 GB/day)	HK$107  (20 GB / 30 days)	Daily — saves HK$34 (32%)

7-day trip

Data needed	Cheapest daily plan	Cheapest fixed-data plan	Cheaper
4 GB	HK$79  (7 days × 2 GB/day)	HK$40  (5 GB / 30 days)	Fixed-data — saves HK$39 (49%)
6 GB	HK$79	HK$62  (10 GB / 30 days)	Fixed-data — saves HK$17 (22%)
10 GB	HK$79	HK$62	Fixed-data — saves HK$17 (22%)
14 GB	HK$79	HK$107  (20 GB / 30 days)	Daily — saves HK$28 (26%)

14 days and longer

Data needed	Cheapest daily plan	Cheapest fixed-data plan	Cheaper
15 GB	Not available — our China daily plans stop at 7 days	HK$107  (20 GB / 30 days)	Fixed-data is the only option
20 GB	Not available	HK$107  (20 GB / 30 days)	Fixed-data is the only option

Read that once more and the pattern is hard to miss: the daily plan wins early and loses late.

The rule, in one line each

• Trip is 5 days or less → buy the daily plan. It is cheaper in every case we priced, by 10% to 32%.
• Trip is around 7 days → it depends on your total use. Under about 10 GB across the week (roughly 1.5 GB a day), fixed-data wins — sometimes by half. Above that, daily takes over.
• Trip is longer than 7 days → in Mainland China, fixed-data becomes your only option: its daily plans stop at 7 days, and the long validity (up to 365 days) is designed for exactly that. Elsewhere the ceiling is higher — Japan and South Korea sell daily plans up to 30 days, and Indonesia, the Philippines and Singapore–Malaysia–Thailand–Vietnam up to 15.

The trap: "price per GB"

This is where people lose money. Sort our China plans by price per GB and one option looks unbeatable:

• 7 days × 5 GB/day → HK$101 for a nominal 35 GB = HK$2.9 per GB
• 5 GB total / 30 days → HK$40 = HK$8 per GB

The first looks almost three times better. But nobody uses 35 GB in seven days. If you actually use 14 GB, that same plan costs you HK$7.2 per GB — more expensive than the 2 GB/day tier at HK$5.6 per GB would have been, and about 30% worse than simply buying what you need.

Unit price only means something against the amount you will really use. Estimate your real total first, then compare — never the other way round.

Not every destination gives you the choice

Across our 16 destinations the structure is not uniform, so start by checking whether you even get to make this call:

Structure	Destinations
Both types	Mainland China — daily plans (1–7 days) and fixed-data plans (30–365 days)
Daily plans only	Hong Kong · Macao · Hong Kong & Macao · China, Hong Kong & Macao · Japan · Japan & Korea · South Korea · Indonesia · Philippines · Singapore, Malaysia, Thailand & Vietnam (10 destinations)
Fixed-data only	United States · Canada · Mexico · UAE · Saudi Arabia (5 destinations)

So for Japan or Korea the question does not apply — pick your daily tier and number of days. For the US or Canada it is the opposite. Mainland China is the one destination where you get to choose.

How to choose in three steps

1. Count the days. 5 or fewer → daily plan. More than 7 → fixed-data. 6–7 days → go to step 2.
2. Estimate your real total data. Navigation and messaging mostly run about 0.5–1 GB a day; add photo uploads and social feeds and you are at 2–3 GB; video streaming is roughly 1 GB per hour. Multiply by your days and add a small buffer.
3. Price both, then check what happens when you run out. If the two are within about 10% of each other, take the daily plan — the reduced-speed fallback means a bad estimate costs you speed, not your connection.

Those usage figures are typical values, not measurements of your phone. Your own history in Settings > Cellular is a better estimate.

Quick answers

Is a daily plan always more expensive for a long trip?
In Mainland China a daily plan is not available past 7 days, so there is nothing to compare — fixed-data is the only option. Elsewhere the ceiling is higher: Japan and South Korea sell daily plans up to 30 days, and Indonesia, the Philippines and Singapore–Malaysia–Thailand–Vietnam up to 15.

Can I buy two daily plans to cover 14 days?
In Mainland China you can, but a single 30-day plan at HK$107 gives you 20 GB and costs less than two 7-day daily plans at HK$79 each (HK$158) — and you keep one eSIM instead of swapping halfway through.

What if I use less than I estimated on a fixed-data plan?
The unused data stays available for the whole validity period, so nothing is lost on the spot — but the difference is not refundable. Estimate slightly low rather than a lot high.

And if I use more?
On a daily plan you drop to 256 kbps and stay online. On a fixed-data plan the connection is cut. If being offline would be a real problem, leave a buffer — that is the single strongest argument for a daily plan.

Which is better for a one-week trip?
Under about 10 GB for the week, fixed-data is cheaper. At or above 10 GB, the daily plan wins. If you cannot estimate, the daily plan is the safer of the two.