Keeping a travel eSIM separate from your main identity

The payment method and the delivery address answer different questions and do not have to point at the same identity. A card carries a name and a billing address; a cryptocurrency payment carries neither, and settles against an amount rather than a person. Whichever you choose, the delivery email is a second, independent identifier, and reusing the address you use for banking attaches the line to everything that address already touches.

An address created for travel purchases, kept for exactly that, is enough. It does not need to be anonymous to be separate — it needs to not be the address that appears in a breach dump next to your bank. Keep it reachable during the trip, because the installation details arrive there and you may need them again.

Most identity leakage through mobile lines happens through the phone number: it is the identifier apps ask for, services verify against, and data brokers use to join records. A line with no number attached simply does not participate in that. It carries traffic and nothing else.

This is a real constraint as well as a benefit, and it is worth being clear-eyed about it. Anything that needs to text you a code needs a number that can receive texts, and a data-only line is not it. Working out before departure which services genuinely require that — and arranging them another way — is what makes the constraint liveable rather than an unpleasant discovery on the second day.

Installing a travel profile puts it alongside everything else on that phone: the accounts, the apps, the advertising identifiers, the location history. If the point of a separate line was separation, installing it next to your primary identity undoes most of the work, and no amount of care at purchase time recovers it.

For most people the honest answer is that this is fine — the separation they wanted was from the hotel network and the roaming bill, not from their own phone. For the cases where it is not fine, the second device is the only real answer, and deciding that before installation is much simpler than deciding it after.