Originally Posted by
jsnydcsa
But, here's my Qs. How do I choose which "number" (e.g. my US Tmo number or my Voda SA number) to "use" to make a call over the voice network? When I press the green "phone" button on the iPhone dialpad - do I get a pop-up that says s/s "Why SIM do you want to use?"
And, similarly - for data - I keep data roaming off on my SA iPhone when in the USA. How do I "set" the phone to choose the right number/SIM to send and receive data over the cell network? Can I keep the TMo data "on" all the time and toggle the SA Voda data "on, off, roaming"?
Yes, you can pick which SIM to use for each call and each SMS. For data, only one SIM will be active at a time. The bigger challenge will be getting the eSIM from Vodacom and activating it outside SA, which may not be possible--some carriers' SIMs can only be activated on the 'home' network.
Originally Posted by
BigFlyer
Because not everyone is as careful or adept as you are. Even if you turn off data roaming, you will still get incoming phone calls on your home SIM. Having said that, my experience is with Android where you can turn a SIM off entirely. My overriding point is removing the home SIM makes it impossible to accidentally roam, so why not remove it?
On iPhones and most recent Android phones, you don't just turn off data roaming, you can switch off the SIM altogether even for physical SIM cards. Only on older Android phones do you actually have to remove the SIM to disable it. On iPhones, the toggle to switch a SIM off only appears if you have at least two SIMs.