eSIM 还是当地实体 SIM 卡：按行程来选

Yes, if your phone can run more than one line. A common pattern is an eSIM for the first days so you land working, then a local SIM once there is time and you know what you actually need. The constraint is how many lines can be active at once, which varies by model and operating system. On a single-tray phone, inserting a local SIM means removing your main one, which can affect verification texts for accounts back home.

There is no numeric answer, because prices differ by country, by operator, by plan size and over time. What can be said is that the cost structures differ: a local SIM often gives good volume for the money within its own market but carries a hidden cost in time and hassle on arrival, while an eSIM prices the convenience in. The honest comparison is to look up real prices for both routes for your specific country and dates, and then add the time each will take.

You can move in either direction. Starting with an eSIM and later wanting a local number, you simply buy the card as normal. Starting with a local SIM and running into trouble, you can install an eSIM profile provided the handset supports it and you have enough connectivity to complete the install. The catch is that installing needs a connection steady enough to finish; with nothing at all you must find Wi-Fi first, which is why preparing before departure remains worth it.

It depends entirely on the country. Some require SIM registration against identity documents, some do not, and which documents are accepted also varies. These rules change from time to time, so check sources for your destination close to your departure rather than relying on a previous trip or on what a neighbouring country does. The rules are not shared.

Three main routes. A local SIM as normal. Roaming through your home operator, on terms and at prices set by them, which is worth asking about directly before you travel. Or, if you own another device that does support eSIM — a tablet, say — putting the connection there and sharing it with the phone. Before deciding, verify what your handset actually supports: some models do support it but need a system update first.

Yes if the phone supports two lines: a local SIM in the tray and an eSIM for data, or the reverse.

Start with an eSIM for the first few days so you land connected, then decide about a local SIM once you can see the situation.