You land somewhere and want data. There are three ways to get it, and the right one depends on how long you stay, how much you use, and how much of yourself you are willing to hand over at a counter.
Roaming with your home carrier
Cost: the worst, almost everywhere. Daily passes of $10 to $15, or per-megabyte rates that produce the bills people write news stories about. Hassle: none; it just works. Privacy: your home carrier already knows everything about you and now also knows where you are, and your identity travels with the SIM. Fine for a weekend if money does not matter.
A local SIM
Cost: usually the cheapest per gigabyte for long stays, since you are buying at local prices. Hassle: real. A kiosk, a queue, a language barrier, and in most countries a passport scan and sometimes a photo, because SIM registration is law in over 150 countries. Then a physical card to swap, and your home number goes dark unless the phone is dual-SIM. Privacy: the worst option. You have handed identity documents to a retailer and been entered into a national registration database tied to that number.
A travel eSIM
Cost: between the two, and closer to local pricing than to roaming; a typical week of moderate use runs a few dollars, and unlimited plans exist for heavy use. On SimBear plans start at under a dollar and, because we compare more than one carrier per country, the price you see is the cheapest we have. Hassle: minutes. Buy before you leave, scan, and turn on data roaming when you land. Your home SIM keeps working alongside it. Privacy: depends entirely on the seller. Most eSIM apps want an account and run trackers. A no-KYC eSIM shop wants nothing: no ID, no email, no account, and it can take a payment that does not identify you either.
Side by side
| Roaming | Local SIM | Travel eSIM | |
|---|---|---|---|
| Cost per GB | Highest | Lowest | Low |
| Setup | None | Kiosk, queue, swap | Scan a QR code |
| ID required | Already on file | Passport, often photo | None at a no-KYC shop |
| Keep home number | Yes | Only with dual SIM | Yes |
| Works before you land | Yes | No | Yes |
| Privacy | Poor | Worst | Best, seller permitting |
When each wins
Roaming for a day or two when cost is irrelevant. A local SIM for a stay of months where you will use a lot of data and do not mind the registration. A travel eSIM for everything else, which is most trips, and for anyone who would rather not be on file in a country they are visiting.