The eSIM retired the local SIM and pricey roaming as the smart way to get online abroad. But Airalo, Holafly, Saily, Nomad and aloSIM charge in radically different ways: one sells cheap per-GB data, another pushes unlimited, and the price for the same destination can triple. We compare price per GB, coverage, hotspot and install, and tell you which to pick for each profile.
14 min read
What an eSIM is and why it retired the local SIM
TL;DRAn eSIM is a digital chip built into your phone that you activate by scanning a QR code, with no physical SIM swap. For travel, that means buying your destination's data in minutes, before you fly, with no airport queue and without losing your home number. It is the connectivity game-changer.
eSIM means "embedded SIM": instead of a plastic chip you slot in, the device has a digital chip programmable from the factory. You buy a data plan online, get a QR code, scan it, and in a minute or two your phone connects to a local carrier at your destination, with nothing swapped physically.
For travel, this solves three old pains. First, you don't have to find a carrier shop at the airport, queue, show a passport and hope the agent speaks English. Second, you keep your home SIM active at the same time (most modern phones run two SIMs together), so you still get bank SMS and keep WhatsApp on your number. Third, you set it all up before flying, on home Wi-Fi, and land already connected.
The catch: your device must be compatible. iPhone XS or newer, most premium Android phones (Pixel, recent Galaxy S/Note, top Motorola) support eSIM. Basic handsets and some region-specific models ship with eSIM disabled. Before buying anything, check your phone's network menu for "Add eSIM" or "Add Cellular Plan."
A point that confuses many people: a travel eSIM is a data-only plan. It does not give you a phone number to receive regular calls or local SMS. Anyone who needs that (to confirm a local sign-up by SMS, say) still relies on a physical SIM or a virtual number service. For 99% of travelers this is no problem: calls and messages travel over WhatsApp, Telegram and FaceTime, which run on the eSIM's data. Your home number stays active on the other SIM for anything essential.
It's also worth debunking the idea that eSIM is new and unstable. The technology is standardized by the GSMA, the same body that defines the world's mobile standards, and runs on real local carrier networks — a travel eSIM is, in practice, a reseller that negotiates wholesale access to those networks and hands it to you digitally. The signal you get is the partner carrier's at the destination, not some lower-quality parallel network.
eSIM vs local SIM vs roaming: what to choose
TL;DRHome-carrier roaming is the priciest and only pays off on ultra-short trips. A physical local SIM still wins on raw price and a local number, but needs a shop and a swap. eSIM hits the sweet spot: nearly as cheap as a local SIM, without the friction of buying in person.
There are three ways to get online abroad, and each has its place.
International roaming means turning on your home carrier's plan abroad. It's the most convenient (do nothing, just enable routing), but usually the priciest per GB and often comes with a small daily allowance. It only pays off on a scale of a few hours or if your carrier offers a genuinely competitive travel pack, which is rare.
Physical local SIM means buying a destination carrier's SIM in a shop. In many countries it's still the cheapest per GB, and it gives you a local number for calls and sign-ups. The downsides: you must find the shop, sometimes register your ID, swap the chip (and keep yours safe), and in some destinations the activation bureaucracy is annoying.
Travel eSIM is the balance. Price per GB lands between the local SIM (cheaper) and roaming (pricier), close to the local SIM at most popular destinations. You swap nothing, visit no shop, keep your number, and activate in minutes. For most travelers in 2026 it's the default choice. A local SIM only wins for long stays with very heavy use or when you genuinely need a local number.
To round out your connectivity and payments budget abroad, see our guide on avoiding hidden ATM and currency fees while traveling.
About the author
Curadoria Voyspark
2 years in the Voyspark editorial team
Time editorial da Voyspark — escritores, repórteres, fotógrafos e fixers em Lisboa, Tóquio, Nova York, Cidade do México e Marrakech. Coletivo. Sem voz corporativa. Cada peça com checagem cruzada por um editor regional e um chef ou curador local.
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