我会连上哪一家网络？

You cannot pick one in advance at checkout. The plan page names the supported networks as far as we can confirm, but the phone itself decides which one to actually connect to based on signal at that moment. You can pick manually afterward from within the supported list via the phone's mobile-network menu, but not ahead of time when placing the order.

Yes, this is normal. The automatic-selection system re-evaluates signal periodically. As long as the internet connection keeps working, nothing further needs to be done — a changing name in the status bar does not by itself indicate a problem.

Because no specific name is confirmed at the time that page was published. We use wording like 'local partner network' instead of guessing or naming something uncertain, so buyers do not form a false expectation.

Switch automatic selection back on immediately, since the chosen network may not be on the list the eSIM profile is authorised for. Letting the system choose again is usually faster than repeatedly trying different manual selections.

Not necessarily, since each country covered by a regional plan usually has its own separate agreement. The network therefore changes according to whichever country you are actually in — check the per-country list on that same plan page before travelling.

It depends on that phone's specific lock condition. Some phones can still install an eSIM profile but will only connect to whichever network the lock permits. Checking the phone's SIM-lock status before buying is worth doing, since this is a device-side condition that cannot be fixed from the plan side.