No. It is stored in this browser only, never sent to a server and not tied to any account.

At least two days out, so there is time to fix anything that fails.

No — keep it for calls and bank OTPs; just switch off roaming data on that line.

No, since the ticked state belongs to the old browser and device. Open the list on the new phone and start ticking again — it does not take long, as it is only a memory aid.

No. Ticking is only a memory aid. Some things, such as a phone's network-lock status, depend on facts entirely outside this list's control.

That is a personal choice — the benefit is being able to read it even if the phone fails or the battery dies. The tool itself only runs in the browser and has no built-in print feature.

Once — the plan-coverage item in this list already covers checking whether one plan spans every country or whether a regional plan is the better fit. There is no need to repeat it per country.

Yes. Clearing this site's data in the browser resets everything, since there is no copy stored anywhere else.

Not the whole thing, but three items are worth a glance: the eSIM line is still listed, roaming data on the home SIM is off, and the offline map opens in aeroplane mode. That takes about a minute, and those are the three where a mistake surfaces latest. Anything already settled at home does not need reopening.

The ticks disappear, because the state lives in this browser alone — no account, no sync. If your preparation spans several days and you would rather not lose it, screenshot the ticked list, or note the outstanding items in whatever notes app you already use.

It depends on that plan's own terms, particularly whether validity starts at purchase or at first connection. Read the plan page and the order confirmation first, and if it is still unclear, message the team with the order number. Until you know, do not install or switch on the line to test it.

Not always, and in some cases you should not. If the plan starts counting from the first connection, switching the line on is the thing that starts the clock. What you want to verify is that the install succeeded, and that shows as the new line appearing in the phone's list of plans — no need to activate it.

Run the list once per device, since each has its own eSIM support, its own lock status, and menus that differ by brand. The smoothest approach is to do all the handsets together at home on Wi-Fi, label each line distinctly, and agree in advance which phone is the one everybody relies on if another fails on arrival.