What unlimited really means on a travel eSIM

Almost every travel eSIM brand now sells an unlimited plan. What you usually buy is not unlimited data at full speed: it is a daily amount of full speed data, and a slower speed for the rest of the day. That is a very good deal for a lot of trips, but only once you know the three numbers behind the word. This guide explains them, shows what six big brands publish, describes what the slower speeds feel like, and walks through how to compare two plans fairly. RoamMore wrote it, and we sell an unlimited plan of our own called Endless, so read the comparison knowing that. Every rival price links to the page we read it on, with the date. If you already know where you are going, see one trip price for unlimited.

What unlimited means on a travel eSIM

An unlimited travel eSIM never runs out and never cuts you off, which is the part the word gets right. What it does not give you is unlimited data at full speed. On most plans a day works like this:

• You get a set amount of data at full speed, for example 1GB, 2GB, 3GB or 5GB.
• When that amount is used, the eSIM keeps working at a slower speed. Brands call it the fair use speed, the throttled speed or the reduced speed. On RoamMore we call it the cruising speed.
• When the day resets, the full speed amount comes back and the cycle starts again.

There are two other shapes you will meet. Some plans give one large pool of full speed data for the whole trip, with a slower speed once the pool is used: Ubigi does this on its 15 and 30 day Japan plans. And Holafly states no daily amount at all. It says only that a local network's fair use policy may slow heavy use, for no more than a day.

None of this is about data that stops. A fixed plan, say 10GB for 30 days, stops when the 10GB is gone, and you top up or buy another. An unlimited plan slows down instead, which is why it suits people who would rather not keep an eye on a meter.

The five things to read on any unlimited plan

Every unlimited plan can be described with five facts. If a store does not state one of them, ask before you buy.

1. The full speed amount each day. This is the number that decides how the plan feels. 1GB a day covers maps, messages, social media and a few video calls. 3GB or 5GB a day leaves room for streaming.
2. The speed after it. 1 Mbps is the common figure among the big brands. Some plans drop to 512 kbps or lower, and a few state no speed at all.
3. When the day resets. Most brands count 24 hours from when the plan starts or first connects, not midnight where you are, so your day may turn over in the middle of the afternoon.
4. Hotspot rules. Some brands allow sharing freely, some cap it, and some ban heavy tethering in their fair use terms. Where sharing is allowed, check whether it counts toward the daily amount.
5. When the clock starts. Most plans start on first connection in the destination, so you can install before you fly. Some start when you install them or when you buy, which matters if you buy early.

How much full speed a day do you need?

A rough guide, using the rates on our data use guide: social media and browsing use about 150MB an hour, a video call about 300MB an hour, standard video about 700MB an hour and HD video about 2GB an hour.

Many travellers who are out sightseeing all day use less than they expect, because the phone sits in a pocket between photos, maps and messages. The heavy days are the ones in a hotel room with a streaming app open. Plan for your typical day, not the heaviest one: on an unlimited plan the heavy day simply finishes at the slower speed.

What 1 Mbps, 512 kbps and 384 kbps feel like

The speed after the daily amount is a small number, so it helps to know what it does in practice. These are the same lines we show on Endless for each speed:

A slower speed is a ceiling, not a promise. On a busy network, or with a weak signal, you may get less than the stated figure, at full speed or after it. Pages load more slowly at 384 kbps, but they load, and a map that is already open keeps working.

What the big brands publish

Here is how six big travel eSIM brands describe their unlimited plans for Japan, read on each brand's own site on 29 September 2026 from New Zealand, in US dollars. Each price links to the page it came from. These are list prices with no codes, credits or memberships, and they change, so check the store before you buy.

Holafly's price was first read on 18 September 2026 and was the same on 29 September. RoamMore's price comes from our live catalogue.

A few details the table cannot hold. Nomad's plans for Indonesia, Vietnam and South Korea slow to 512 kbps rather than 1 Mbps. Saily's Mexico plans carry 3GB or 5GB a day depending on the length. Ubigi's 15 and 30 day Japan plans are a pool for the whole trip, 30GB and 60GB, then 2 Mbps. Jetpac shows its price as a discount from a higher struck price. Holafly caps hotspot sharing at 1GB a day on its trip plans, and says a slowdown from heavy use lasts no more than a day. Airalo says there is no tethering limit on its unlimited plans and that shared data counts toward the daily amount.

Compare allowance to allowance

That table is not like for like, and that is the trap in most unlimited comparisons. A week with 3GB of full speed a day is a different product from a week with 1GB a day, even though both are sold as unlimited.

So start from your own use, then compare plans with the same daily amount. On Endless, a week in Japan costs:

• US$14.50 at 1GB a day,
• US$26.40 at 2GB a day, Nomad's amount,
• US$40.40 at 3GB a day, Airalo's and Jetpac's amount.

Put those beside the table. If you really use 3GB or more every day, the plans built around 3GB or 5GB a day were priced for you, and one of them may well be the better buy. If 1GB covers your day, paying for a bigger daily amount you will not touch is money spent on the word unlimited.

The other half of the comparison is the length. Airalo sells packs of 3, 5, 7, 10, 15 and 30 days, and Jetpac adds 21, so a 12 day trip means a 15 day pack with three days unused or two eSIMs. Saily lets you pick any length from 1 to 30 days in Japan, Holafly from 1 to 90, and Endless from 1 to 60, each with its own price. Compare the price for your exact trip, not the nearest pack.

When unlimited beats a fixed plan, and when it does not

Unlimited is not always the cheaper way to stay online. A fixed plan gives you a set amount of data for a set number of days and stops when it runs out. In Japan, 10GB for 30 days on RoamMore is US$12.10.

A fixed plan usually wins when:

• you know roughly how much you use, and some days you will hardly use any,
• your trip is long and your use is light, because one fixed allowance stretches across every day,
• you do not mind topping up if you run low.

Unlimited usually wins when:

• you stream or make a lot of video calls,
• your use changes a lot from day to day and you would rather not watch a meter,
• running out in the middle of a day would be a real problem, on a work trip or with children who need a map.

On Endless we show a fixed plan beside your pass, under Standby options, whenever one lasts the whole trip, holds at least three quarters of the full speed data you picked and saves 25% or more. If you know how much data you use, that fixed plan is often the cheaper buy, and we would rather you bought it than paid for data you do not need.

A worked trip price

Here is how one trip adds up on Endless, using Japan at 1GB a day for 14 days. Every figure comes from our live catalogue.

1. One day at 1GB in Japan is US$3.80.
2. Fourteen days at that day price would be US$53.20.
3. The trip price for 14 days is US$27.

Why the gap? A day price has to cover the costs of setting up an eSIM, and a per day plan charges them again every day. A trip price charges them once. So the first day costs the full day price and each day after it costs less. For a month in Japan at 1GB a day, the trip price is US$55.40. All prices are in US dollars, and the exact price for your dates shows on your pass before you pay: try your own trip on Endless.

How Endless does it

Endless is RoamMore's unlimited plan, and it is built around the five facts above.

• Full speed each day: you choose it, from 0.5GB to 10GB a day in Japan. The sizes on offer depend on the destination.
• The speed after it: each size has one stated cruising speed, 1 Mbps wherever our supplier offers it and never under 384 kbps. You see it at the slider and on your pass before you pay.
• The reset: the full speed amount refills every 24 hours, counted from when you first connect in the destination.
• The clock: your days start when the eSIM first connects in the destination, so you can install it at home up to 180 days before you fly.
• The length: any number of days from 1 to 60, at one price for the whole trip.

Two limits to know. Days cannot yet be added to a live Endless eSIM, so cover every day you are there, including the day you land and the day you leave. And if you plan to share your connection with a laptop, email us before you buy and we will tell you what the plan in your destination allows. If your plans change, you get a full refund within 30 days of purchase as long as the eSIM has not been installed.

Before you buy any unlimited plan

• How much full speed data do I get each day?
• What speed do I drop to after it, and is it stated as a number?
• When does the day reset?
• Can I share my connection, and does sharing count toward the daily amount?
• Does the clock start when I buy, when I install or when I land?
• What does my exact trip length cost, rather than the nearest pack?

If a store answers all six, you can compare it with anything. When you are ready, see one trip price for unlimited on Endless.

Prices for popular trips

• Japanfrom US$3.60
• United Statesfrom US$3.80
• Europefrom US$3.40
• Thailandfrom US$3.60

Cheapest plan with 1GB or more, in US dollars from our catalogue, updated 27 Sep 2026.