eSIM for a two or three day city break

Validity is stated as whole days on the plan page. Check how that specific plan counts a day, and build in a small buffer rather than cutting the calculation so fine that there is no margin left.

Almost none — which is exactly why installing before departure matters so much. Any problem surfaces while you can still get help, not the moment you've landed with no time left.

Only if that plan explicitly states tethering is allowed on the plan page. Always check before buying — not every plan permits it.

Either can work; it depends on how fixed your travel date is. Check the plan page's activation line for the exact rule before deciding.

For a first-connection plan, no effect, since the clock follows the actual connection at the destination. For an on-purchase plan the clock has already been running since the purchase date, so arrival time doesn't change it either way.

Count from the first day you genuinely need data to the last, which usually includes both travel days — so two nights normally spans three calendar days rather than two. How days are counted, and when counting starts, is set by each plan, so read that plan's page before buying.

Always install before flying, on Wi-Fi: installation needs an internet connection, and if anything goes wrong you still have time to fix it. Switching the line on is a separate step from installing, and when the validity period starts depends on the plan, so check its page.

The usual option is to buy another plan and install it alongside, which works if your handset supports several profiles. Whether the original plan can be topped up depends on that plan. In the meantime, use Wi-Fi at the accommodation or a restaurant as a bridge, and message us on LINE or by email.

Yes, provided you keep the original SIM in place with calls and SMS enabled, turn its data roaming off, and let all data run through the eSIM line. What receiving SMS abroad costs is a matter for your Thai operator, so ask them before you travel.

It depends on the plan: some permit tethering and some do not, and the condition is stated on each plan's page. Where it is allowed, allow extra data and give the sharing phone its own power bank, because both data and battery drain much faster.

Use the device checker on the site to look up your model, and confirm the handset is not carrier-locked. The menu for adding an eSIM sits in different places by manufacturer and OS version, so read it alongside the install guide. If you are unsure, message us with the model and we will check it with you.