Unlimited vs fixed data eSIM, which should you buy?

Every destination page on this site lists both kinds of plans, and the same question comes up: is unlimited worth it? Most of the time, no. Sometimes, absolutely. Here is how I decide.

The two kinds of plans, in one minute

A fixed data pack gives you a pool, say 10 GB, valid for a window like 30 days. Use it fast or slow; when the pool is gone, the plan throttles to a slow speed or stops.

An unlimited plan is priced per day. Most give you full speed up to a daily allowance, then slow you down until midnight. True uncapped unlimited exists but costs the most.

A day pass sits in between: a daily allowance like 1 GB per day that resets each morning, priced per day of your trip.

The math I actually use

I look at one number: price per GB I will realistically use.

On my pages a mid size fixed pack usually lands between $0.40 and $2 per GB. Unlimited plans, once you divide by the data a normal person uses in a day, work out 2 to 4 times more expensive. If I use 500 MB to 1 GB a day, a $30 unlimited week costs me $4 to $8 per real GB. The 10 GB pack sitting one row above it costs a fraction of that.

So my default is simple: fixed pack, sized one tier above what I think I need. The extra tier costs a dollar or two and removes the anxiety.

The three cases where unlimited wins

1. You tether a laptop. Remote work burns data in a way no pack survives. Video calls alone are 500 MB an hour. If the trip is also a work trip, buy unlimited and stop thinking about it.
2. You navigate and translate all day, every day. Two weeks of full time maps, translation apps, and ride hailing in a country where you cannot read the signs adds up faster than city breaks do.
3. Kids with tablets. A family sharing one hotspot line is a data furnace. One unlimited plan beats three ran-out packs bought at panic prices.

Watch the throttle line

The dirty secret of both plan types is what happens after the allowance. Some plans drop to 1 Mbps, which still loads maps and messages fine. Some drop to 128 kbps, which is fine for texts and little else. A few just stop.

I list the throttle speed on every plan row on my destination pages, because two plans with the same headline price are not the same plan if one dies at the cap and the other keeps limping along usefully.

My short version

• Weekend or one week city trip: fixed pack, 3 to 5 GB.
• Two weeks, normal tourist use: fixed pack, 10 GB.
• Work trip or family hotspot: unlimited, and check the daily fair use cap before buying.

Whatever you pick, the country pages sort both types into one table so you can run the per GB math yourself.