[systemtest]

Works great on iOS but can be a bit fidgety. I bought a data-only eSIM for Switzerland and as I crossed the French/Swiss border I had to go deep into the settings menu to enable the eSIM, set it as the data primary and keep using my primary SIM for phone calls and FaceTime, but then also disable data roaming on my primary SIM as to not accidentally occur charges in case reception of the eSIM fails. And disable roaming on the eSIM so I wouldn't occur extra cost if it connected to the French network, as I was close to the border. When going back to France I would disable the eSIM, set the data primary back on my primary SIM and enable data roaming on that SIM (after waiting for it to connect to the French network).

It would be nice if there was a more hands-off approach when crossing a border, or some sort of "do whatever is going to cost me the least amount of money" approach to roaming and having two SIMs.