什么时候买 eSIM 比较好？

Technically yes, but it is not recommended, because a failed installation or a device problem leaves no time to fix it before boarding. If you must, finish it before leaving your accommodation rather than waiting until you reach the airport.

Not directly, since buying and installing can be done anywhere with an internet connection. What the time zone does affect is how quickly support can reply, so if you are in a very different time zone from the support team, leaving margin in advance matters even more.

The profile stays on the device, but if it is an activation-start plan that has already been activated, its validity keeps running down unused. Contact support with your order number so we can check what is possible under that plan's own terms.

It depends on that plan's own terms and whether it has already been activated. Some can be adjusted, others cannot at all. Contact support with your order details so we can check case by case; we will not promise in advance that it is always possible.

There is no pricing adjustment based on how far ahead you buy; the price shown at checkout is the price that applies at that time. Buying early or late should be decided by validity and how settled your itinerary is, not by price.

If it has not been installed or activated yet, it is usually easier to adjust. Contact support at once with the order number and the correct travel dates, and hold off installing until you hear back.

No, and it is often better not to, since an activation-start plan loses time if activated before you actually reach that country. Buy and install each one in the order you will reach that country instead.