Holafly vs co:sim: Unlimited Data eSIM Plans Compared

Holafly sells "unlimited" data bound by a fair-use policy it doesn't fully disclose; co:sim sells fixed-data or daily-allowance plans, and a subset use a daily-throttle model where speed drops instead of a hard cutoff. Neither is truly limitless, and neither is as restrictive as the words "unlimited" or "capped" suggest on their own. This guide compares what each provider's own terms actually promise, so you can judge a heavy-data trip against the real mechanics instead of the marketing label.

#What does Holafly's "unlimited" actually promise?

Holafly's own Terms and Conditions state that an "unlimited" Trip Data Plan carries no fixed allowance that automatically stops data use, but that coverage and speed "may be subject to a network service provider's fair use policy," which can reduce speed if usage is judged excessive or disruptive to other users on that network (esim.holafly.com/terms-and-conditions). Holafly's FAQ adds that when a fair-use reduction applies, it typically lasts no more than a day before normal speed returns (esim.holafly.com FAQ, cited in third-party research). What Holafly does not publish is the exact data threshold that triggers this: independent reviewers report throttling after roughly 2-5 GB of use in a single day, but that range comes from third-party testing across different countries and operators, not an official Holafly number, so it should be read as an estimate rather than a guarantee.

#How does co:sim's data model actually work?

co:sim doesn't sell unlimited plans. Its data-only eSIMs are fixed-GB or daily-allowance, and every plan page states the exact data amount, validity period and install deadline before checkout, rather than describing the limit only in a fair-use clause. A subset of co:sim's plans use a daily-throttle FUP model instead of a hard cutoff: once that plan's daily data threshold is crossed, speed drops rather than the connection stopping entirely, and it resets on a fixed schedule shown on the plan page. That's a real limitation worth planning around on a heavy-use day, but it's a different mechanic from a connection simply cutting off once a fixed total is used up, and different again from Holafly's undisclosed-threshold fair-use model.

#Which model actually suits heavy daily data use better?

It depends on which kind of "limit" you'd rather plan around: an undisclosed daily fair-use trigger, or a stated data amount you can track yourself. Holafly's advantage is genuine for unpredictable heavy use: because the plan is sold as unlimited, you're not counting gigabytes day to day, and normal browsing, maps, messaging and moderate streaming rarely reach any provider's fair-use threshold. Its disadvantage is the same lack of disclosure: you can't know in advance exactly how much daily streaming or hotspot use is "too much" before speed drops, because Holafly doesn't publish that number.

A fixed-data or daily-throttle co:sim plan is more predictable in the other direction. Because the data amount and, where relevant, the daily threshold are stated on the plan page rather than buried in a fair-use clause, you can size the plan to your actual trip and know exactly where the ceiling sits, rather than discovering it mid-trip. For a data-heavy trip to somewhere like Thailand, checking co:sim's Thailand eSIM plans for the exact allowance is the more direct comparison than guessing at either provider's real-world limit.

#FAQ

#Does Holafly ever actually cut you off?

Not according to its own Terms and Conditions: an "unlimited" Holafly plan has no fixed data allowance that automatically stops the connection. What can happen instead is a fair-use speed reduction, imposed by the local network operator rather than a hard Holafly-side cutoff, if your usage is judged excessive or disruptive to other users on that network (esim.holafly.com/terms-and-conditions). Holafly's own FAQ states that when this reduction applies, it's typically limited to one day, with normal speed restored the next. The catch is that Holafly doesn't publish the exact daily data amount that triggers a reduction, so travelers can't know in advance precisely how much heavy streaming or hotspot use is "too much" on a given day, only that it's possible after sustained heavy use.

#What happens when a co:sim daily-throttle plan hits its limit?

On the co:sim plans that use a daily-throttle FUP model, crossing that day's data threshold reduces connection speed rather than stopping data entirely, and the allowance resets automatically on the schedule shown on that plan's own page. That means a heavy-use day slows the connection for browsing and messaging rather than cutting you off completely, and normal speed returns once the next reset happens. This is different from a fixed-GB co:sim plan with no daily throttle, where the plan simply has one set total for the whole validity period and doesn't reset day to day at all. Which model applies to a specific co:sim plan, daily-throttle or a flat total, is stated directly on that plan's own page rather than left for the traveler to discover mid-trip, so it's worth checking before assuming either behavior applies to the destination you're buying for.

#Is Holafly's 6-month refund window actually better than co:sim's 30 days?

Only for a very specific case: an unused, unactivated Holafly eSIM bought up to 6 months ago. Holafly's refund policy allows a full refund if the eSIM hasn't been activated and the purchase was made within 6 months, and even an activated eSIM can qualify for a partial refund minus a $3.50 admin fee in some cases (esim.holafly.com/refund-policy). co:sim's window is shorter on paper, 30 days from purchase, but it's capped by the plan's own install deadline rather than a flat number, and it only applies while the eSIM is still uninstalled (cosim.io/en/policies/refund). For most travelers who buy close to departure, the practical difference is smaller than the headline numbers suggest.

Holafly's "unlimited" and co:sim's fixed-data-plus-throttle model are two honest but different ways of describing a real limit, not a simple better-or-worse pair. Which one actually saves you a mid-trip slowdown depends on your real daily usage and how much you'd rather know upfront versus not think about at all.