在国外用 Wi-Fi 通话：怎么设置才真的能用

Switch data roaming off on the home SIM, because the feature runs over Wi-Fi or over the data line you have nominated anyway. Leaving data roaming on is the main route to charges you did not intend. Whether you keep roaming enabled for calls and SMS alone is a judgement about your operator's rates, so ask them what those rates are before deciding.

Try the toggle first, because not every operator insists on domestic first-time activation. If it will not complete, the remaining options are to contact the operator and ask them to enable it from their side, or to move to chat apps as your main channel for the rest of the trip and sort the number out when you are home. In the meantime, tell the people who need you where to find you.

Over Wi-Fi it uses none of the eSIM's data. If you allow the feature to run over the data line, or the phone falls back to data mid-call, that traffic counts against whichever line is nominated for data. Voice uses little per minute compared with video, but if you talk at length every day it belongs in your estimate from the start.

Check three things in order: whether the Wi-Fi login page has been cleared, whether the feature's indicator is still showing, and whether the home line itself has been switched off entirely. If all three look right and it still fails, try a hotspot from your data line and connect the phone to that instead. If it still fails after that, the cause is most likely entitlement on the operator's side, which only they can change.

No, because the feature needs an internet connection to exist before it can do anything — it does not create one. With hotel Wi-Fi alone you are reachable only while you are in the hotel, which is a small share of the trip. A data line that works all day is still necessary, and this feature is the complement that keeps your home number alive rather than a substitute for it.

Entitlement on your home number, billing and SMS delivery all belong to the operator that issued the SIM, because those live in their systems. For anything about the travel eSIM itself — installing the profile, or which line is set for data — message LINE @esimonline at https://lin.ee/skDPoNx or email esimonline.asia@gmail.com, and include your phone model and the country you are in so the answer can be specific.

You can enable roaming for calls and SMS only, with data off, or move to app calling and tell people in advance how to reach you.

Over Wi-Fi it does not. If the phone falls back to mobile data mid-call, it starts using the data line you configured.