Unlimited data eSIM plans: where the slowdown starts, and what they cost

Is an unlimited data eSIM really unlimited?

No unlimited data eSIM we cover is unlimited at full speed. You won't run out, and you'll never be cut off, but every seller that publishes a rule slows you down after a daily amount of fast data. The word describes the allowance, not the speed.

That's not a scandal. It's how the networks underneath manage traffic. The useful question is where the slowdown starts and how slow it gets, and only two of the brands on this site put numbers on it. We read each policy on 9 November 2026. The prices further down are our checkout readings from 13 to 18 August 2026, in US dollars, and none of this is a test on a handset.

The fair-use rules, brand by brand

Brand	Fast data per day	Then	Resets
Airalo	3 GB (default)	1 Mbps	24 hours after activation time
Nomad	2 GB	512 kbps	Within 24 hours
Holafly	No figure published	Not stated	Next day

Airalo is the clearest. Its policy says that past 3 GB in a day it will throttle you "to 1 Mbps for the rest of that day", and that some packages set a different threshold, shown before you buy. Airalo says messaging, simple browsing, maps and lower-quality video calls still work at that speed, while streaming and big downloads crawl. The day is counted from when you activated, not from midnight. Tethering has no limit on devices. Reselling, peer-to-peer file sharing and hosting servers are banned.

Nomad's unlimited plan page is shorter and harsher: more than 2 GB a day and "your speed will be throttled to 512 kbps", for up to 24 hours. That's half Airalo's throttled speed after two-thirds of the fast data. At 512 kbps, messaging and maps get by. Video calls struggle.

Holafly gives no number. Its FAQ says some operators apply a fair usage policy "that may reduce speeds after you reach a certain high-speed data limit", that this is "not a restriction applied by Holafly", and that the slowdown lasts no more than a day. Its hotspot is "not unlimited"; the Europe page we read allows 1 GB of sharing a day. More on Holafly unlimited data.

Saily sells unlimited plans at 5 to 30 days, but its policy pages refused our reader and we hold none of its unlimited prices, so we say nothing more. That's a real gap, and we'd rather show it than paper over it with figures quoted on other sites. eSIMCard has no unlimited prices left in our data, and eSIM Go sells to businesses, not travellers.

What does unlimited data cost in Europe?

The best eSIM for Europe with unlimited data depends mostly on trip length. For a week, the three sellers sit within a few dollars. For a month, Airalo wins.

Nomad has a third ladder. In thirteen European countries, from Belgium and Denmark to Ireland and Sweden, its unlimited plans cost $11, $18, $25 and $33 for three, five, seven and ten days. Cheap, until you remember the 2 GB line.

Across every same-length pair we compared, Airalo was cheaper than Holafly 223 times in 248. The long version is in Airalo vs Holafly, and the region overview is best eSIM for Europe.

Is a Japan eSIM with unlimited data worth it?

Usually not. Here are the week and the month:

Japan	7 days	30 days
Nomad	$25	not sold (21 days is $49)
Airalo	$27	$69
Holafly	$27.50	$73.90

Now set that against Nomad's metered 50 GB for 30 days at $35. That plan costs about half Airalo's unlimited month and gives you more than most visitors use. The Japan guide makes the same call: unless you're tethering a laptop or streaming on trains, buy gigabytes.

Unlimited data eSIM for the USA

Fewer choices here. We hold no Holafly prices for the United States, and no Saily unlimited ones. That leaves two:

USA	7 days	10 days	30 days
Airalo	$25	$34	$68
Nomad	$32	$42	not sold (20 days is $65)

Nomad's 10-day unlimited undercuts Airalo's in 32 of the 42 countries where both sell one. The US is one of the exceptions, and Airalo also comes with the more generous 3 GB a day. That's the pick. If you'll stay under 50 GB, Airalo's metered 50 GB for 30 days at $42 costs $26 less than its unlimited month. Full tables are on the USA guide.

When does unlimited beat a metered plan?

Do the sum with the daily cap, not the headline.

A week of Airalo unlimited in Germany is $24. At 3 GB a day, the most fast data it can ever deliver is 21 GB. A week of Nomad unlimited in Ireland is $25 for at most 14 GB at full speed. So "unlimited" is really a daily ration with a slow tail, and its value depends on whether you'd hit the ration every day.

Our view: unlimited earns its price on short, heavy trips. Three to seven days, lots of video calls, a laptop on hotspot, no idea how much you'll use. For a month it's poor value nearly everywhere we've priced it. In Spain, Airalo's 50 GB for 30 days is $39 against $63 for unlimited. In Germany it's $36 against $59. Most people never come close to 50 GB, and the ones who do usually know it before they leave.

Two last checks before paying. Hotspot: Airalo allows it without a device limit, Holafly's allowance depends on the plan, so read the line for your destination. And the clock: Airalo's day starts at your activation time, so a plan switched on at 6 pm resets at 6 pm. The details sit in Airalo unlimited data, and for metered plans ranked by price per gigabyte, see cheapest eSIM.