Holafly made one idea famous: stop counting gigabytes, pay for days instead. For some trips that is a genuinely good deal. For others it is a quietly expensive one — and the difference has very little to do with the brand. It is about which of two pricing models your trip actually fits.
Declaring the bias up front: we sell sized plans, so we are one of the alternatives. What follows is a decision rule rather than a verdict — one you can apply to any provider, ours included, with their own pages open. We don't quote anybody's prices, including our own. Every line-up in this market gets repositioned, and a price printed in a blog post is wrong by the time you read it.
The two models, in plain terms
Day-rate unlimited. You choose a number of days and the data isn't counted against an allowance. There's still a fair-use policy behind it, set by the local network rather than the reseller — Holafly's own FAQ says that speeds may be reduced after heavy high-speed use, and that the hotspot is not unlimited, with the specifics varying by destination (checked October 2026). Read the terms for your destination, not the headline. We unpacked what that word really promises in what "unlimited" actually means.
A sized allowance. You buy an amount of data with a validity window. The number is visible, you can see what's left, and a VamosData eSIM can usually be topped up from your account if you underestimate. You are buying a quantity instead of a day rate.
Neither is a trick. They're two different bets on your own behaviour.
When unlimited genuinely pays off
- Long stay, heavy daily use. Hours of video calls, streaming on the move, large photo or video uploads every evening. Past a certain level of daily use, paying by the day stops being the expensive option.
- You tether a laptop every day. But check the hotspot rule before you buy, because it's often metered separately from phone data — that single line in the terms can settle the purchase on its own.
- You simply don't want to think about it. Paying for the absence of a decision is a legitimate purchase, as long as you know that's what you're buying.
When you're paying for headroom you never use
- Short trips with ordinary phone use. Maps, messaging, a few reels, a boarding pass. A day rate doesn't care that you spent two of your five days in a conference centre on Wi-Fi.
- Hotel and cafe Wi-Fi most of the day. Plenty of travellers only need mobile data for the gaps between networks.
- Multi-country routes. If you're crossing three borders, the question isn't unlimited-or-not, it's single-country-or-regional. Our guide to choosing a regional plan covers that trade-off.
- Your line is from the EU or EEA and you're staying inside it. "Roam like at home" may already cover you, subject to your operator's fair-use cap — see where that rule stops working.
Get your own number before you compare anything
Most people guess their data use, and most guesses are wrong in the same direction — too high. You don't have to guess, because your phone has already measured it. Look up the mobile-data usage figure in your settings for a normal week at home (iOS: Settings → Mobile Data; Android: Settings → Network & internet → Data usage), and treat that as your baseline.
Then adjust for the trip, not the anxiety: more maps and ride-hailing, less background streaming on home Wi-Fi. Our day-by-day breakdown by traveller type does that arithmetic for you, and every VamosData country page has a plan finder that asks three questions and points at a size.
With a real number in hand, the comparison takes two minutes instead of an evening of tab-switching.
The alternatives, by trip shape
| What your trip looks like | The shape that fits |
|---|---|
| Heavy use, one country, two weeks or more | Day-rate unlimited — if the fair-use and hotspot terms are published |
| Normal phone use, one country | A sized plan matched to your baseline |
| Several countries on one route | A regional plan, so one setup covers the whole trip |
| Months in one place | A local prepaid SIM once you land, after this honest comparison |
| An EU/EEA line travelling in the EU | Possibly nothing at all — check your own tariff first |
If your destination is Spain specifically, we put the three big names side by side in this comparison.
Three checks before you pay anyone
- Confirm your handset supports eSIM on the device checker — that's a property of your phone, not of any plan.
- Install before you fly, on home Wi-Fi, with the iOS or Android guide.
- Remember that a data-only line needs data roaming switched on — the most common reason a perfectly good eSIM looks broken on arrival.
Where we stand
Two things here are structural rather than promotional. A VamosData eSIM is bought and managed on the web, with no app to install and an email alert when the allowance runs low — handy at an airport on a dying battery. And the refund rule is written down rather than implied: a plan that hasn't been installed or activated, still inside its validity period, is refunded in full (terms, section 10).
Beyond that, use the rule above. Unlimited isn't a trap and sized isn't automatically cheaper — one of them matches how you actually use your phone, and that's the only comparison worth doing. Live plans and sizes are on the destinations page.