I am thinking of purchasing a new iPhone with dual SIM (eSIM) capability and am confused reading Apple's setup instructions. In particular, I do not understand one of the options when setting the Default Line:
This does not make any sense to me because iMessage and FaceTime both require data. So, if only Secondary is used for data, then how is it possible to use iMessage and FaceTime on the Primary??? In this case, are iMessage and FaceTime on the Primary *only* available while using Wi-Fi? Or, is there some possible way that iMessage and FaceTime can be "carried" over the Secondary data line but directed to the phone number associated with the Primary when not on Wi-Fi?
If one chose the 2nd option instead -- Use Secondary as your default line -- then what happens if someone with whom you previously had some iMessages attempts to text you (to your Primary number)? Do those messages just get queued up and saved until you revert your default line back to the Primary at which time then they are delivered and you will see them? Or, do those texts still come through, but sent as SMS instead to your Primary?
Use "Secondary" for cellular data only: You might want to select this option if you're traveling internationally and you want to keep Primary for voice, SMS, iMessage, and FaceTime. This will allow you to use Secondary for data.
This does not make any sense to me because iMessage and FaceTime both require data. So, if only Secondary is used for data, then how is it possible to use iMessage and FaceTime on the Primary??? In this case, are iMessage and FaceTime on the Primary *only* available while using Wi-Fi? Or, is there some possible way that iMessage and FaceTime can be "carried" over the Secondary data line but directed to the phone number associated with the Primary when not on Wi-Fi?
If one chose the 2nd option instead -- Use Secondary as your default line -- then what happens if someone with whom you previously had some iMessages attempts to text you (to your Primary number)? Do those messages just get queued up and saved until you revert your default line back to the Primary at which time then they are delivered and you will see them? Or, do those texts still come through, but sent as SMS instead to your Primary?