Yesim

Yesim is a travel eSIM built around flexibility of purchase rather than a fixed shelf of packages. It assumes you do not always know how much data you will use, or exactly when the trip will happen, and it prices and schedules around that uncertainty: data sold by the gigabyte, unlimited day passes, and the ability to buy now and activate up to a year later. If your plans firm up late or move often, that flexibility is worth real money. If you take one predictable trip a year to one country, a fixed package from a straightforward catalogue is cheaper to reason about and you will not use what you are paying for here.

Coverage, and three different ways to buy

Yesim covers more than 170 countries through partnerships with over 800 mobile operators. Buying splits three ways. Local plans cover a single country. Regional plans cover a group of them. And the Pay and Fly model prices data by the gigabyte rather than by package, starting at 1.10 US dollars per gigabyte, checked August 2026, which is the option for a trip where the data requirement is genuinely unknown. Sitting alongside those is the Unlimited Day Pass, priced by the day: rates for popular destinations including Thailand, the United Arab Emirates and China run from 1.68 to 3.56 US dollars a day, checked August 2026.

Choosing between them is a question about your own habits rather than about Yesim. A heavy user on a short trip almost always lands on the day pass, because unlimited for four days beats guessing at gigabytes. A light user on a long trip lands on pay-per-gigabyte, because the days would otherwise be paid for whether or not the phone was used. Someone who already knows their number takes the fixed local plan. Because all three sit in one account, guessing wrong last time does not lock you in this time.

Plans can be activated immediately on purchase, or you can select activate later and hold the plan for up to 12 months before starting it. This is the mechanic that most distinguishes Yesim from providers whose plans start automatically at the destination or after a fixed window. It matters in two specific situations. The first is a trip that might move: a conference that shifts, a visa that runs late, a booking that gets rescheduled. The second is buying opportunistically, taking a price you see now and using it whenever the trip finally happens. Neither is possible with an auto-activating plan, and both are common enough to be worth a category of their own.

Data only, and what Yesim does about that

The eSIM plans are data-only. There is no phone number, no voice minutes and no inbound SMS attached to them, with calls expected to run over VoIP apps such as WhatsApp, Viber or Facebook Messenger. That is normal for the category, and for most travellers it is fine, right up to the moment an account insists on texting a verification code to a number you cannot currently receive on.

Yesim addresses that with a separate product rather than leaving it unspoken. Virtual Numbers are sold at 7.20 US dollars a month, checked August 2026, currently in Canada, Israel, the Netherlands and the United States, with the country list described as regularly updated and expanded. They receive SMS, including one-time passcodes, readable on the website or in the app, and they require no SIM or eSIM at all. Yesim states that signup for them does not require ID verification or KYC. Because it is a separate line item, you can decide whether you need it rather than discovering the gap mid-trip.

Practical details that change how a trip goes

Personal hotspot and tethering are enabled by default, which is not universal in this category and matters immediately if you travel with a laptop or with someone whose phone is not set up. The connection switches automatically to 5G networks where they are available. Yesim also includes VPN security features and runs referral and loyalty reward programmes.

Money is handled through an internal currency called Ycoins. You top the account up using Visa, Mastercard, Apple Pay, Google Pay, PayPal and other methods, and purchases draw the balance down, so buying a second plan mid-trip is not another card transaction from an unfamiliar country. Support runs 24 hours a day in multiple languages. Device requirements are the usual ones for this category: an Apple or Android handset that supports eSIM, with the full compatibility list published on the site.

Who it fits

Yesim suits the traveller whose plans are provisional and whose usage is variable, and who would rather hold a purchase in reserve than commit it to a date. The combination of per-gigabyte pricing, day passes and 12-month deferred activation is a coherent answer to that whole situation rather than three unrelated features. It fits less well if you want one price decided once, or if the countries you visit sit outside a 170-country footprint, in which case a broader marketplace with fixed packages will give you a shorter path from question to purchase.

Flexibility is the product

Most travel eSIMs ask you to pick a package size and a validity window before you leave. Yesim lets you avoid that commitment in three separate ways: data priced by the gigabyte through Pay and Fly from 1.10 US dollars per GB, Unlimited Day Passes priced per day with popular destinations such as Thailand, the UAE and China between 1.68 and 3.56 US dollars a day, and fixed local or regional plans if you already know your number. All three sit in one account across more than 170 countries and over 800 partner operators. Prices checked August 2026.

Buy now, start when you are ready

The activate-later option holds a purchased plan for up to 12 months before the clock starts. If your trip might shift, or you simply want to take a price now and travel later, this is the mechanic that makes it possible. Providers whose plans auto-start at the destination or after a fixed window cannot do it.

The things that matter once you land

Hotspot and tethering are on by default, so a laptop or a second traveller is covered without extra configuration. The connection moves to 5G automatically where it exists. Balance lives in Ycoins, topped up by card, Apple Pay, Google Pay or PayPal, so a mid-trip top-up is not a fresh card transaction from an unfamiliar country. And if you need an inbound number for verification codes, Virtual Numbers are sold separately at 7.20 US dollars a month in Canada, Israel, the Netherlands and the United States, needing no SIM or eSIM at all.

Who should look at something else

If you want the number bundled cheaply into the data plan rather than bought separately, Saily sells a US number at 0.99 dollars a month. If you would rather settle one fixed price before departure than watch per-gigabyte or per-day consumption, a fixed-package marketplace such as Airalo is a simpler purchase. And if you are abroad continuously and want a large monthly allowance that renews itself, a subscription such as GigSky One is the right shape. Yesim is the answer when the trip is not yet certain and the usage is not yet known.