About this guide

Travsim is a question-and-answer project rather than a manual. It assumes that most people arrive with a specific doubt — will this work on my phone, will I lose my number, is Switzerland included — and wants that doubt addressed directly, with the surrounding context supplied afterwards.

How the answers are written

Each section begins with the direct answer, then explains the conditions under which it holds. This structure is deliberate: a reader standing in a queue needs the first sentence, and a reader planning a trip needs the second paragraph.

Where an answer depends on a provider, a tariff or a device region, the text says so rather than generalising. Where the common belief is wrong, the text corrects it explicitly, for example the assumption that Europe-wide means every European country.

Who it is for

First-time buyers of travel eSIMs, and travellers who have used one before but were surprised by something. The content assumes no technical knowledge and no particular device brand, and avoids recommending any provider.

Limits

Answers here are general and evergreen. They cannot account for a specific plan's terms, a particular operator's charges or a device fault. Nothing on this site is a promise of coverage, price or performance, and the provider's own documentation always takes precedence.

The site is independent, unsponsored and unaffiliated with any provider, operator or manufacturer. It does not sell eSIM plans, does not accept payment for mentions and does not collect reader data.

Corrections and suggestions are welcome once the operator has configured a contact address. The contact page explains what information to include.