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tekfranz

macrumors regular
Original poster
Mar 16, 2017
191
51
If both of my eSim lines have voice & data available do they switch automatically when one line has no service?

Is it necessary to switch on “Allow Cellular Data Switching ” to switch from a line with no service to a line with service automatically? Or is the “Allow Cellular Data Switching” option for cases where one line does not have a data alotment so it can use the data alotment of the line that does have data?

Does “Allow Cellular Data Switching” help my phone switch from a line with no service to a line with service?
 

gurase

macrumors 6502
Oct 12, 2015
275
167
Yes, Allow Cellular Data Switching will automatically use the data on the other line if the primary data line does not have service.
 
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tekfranz

macrumors regular
Original poster
Mar 16, 2017
191
51
OK, I will switch it on.
The switch makes a bit more sense because one cannot disable data individually per line.
So far it seems like that switch does these three things:
1. Allow a line that is not default for data to be used for data anyway.
2. Allow a line with no service to use the line with service for WiFi calling.
3. If a voice call is made on a network where it can’t do simultaneous voice and data the other line is used for data.
4. Allow a line with no service to switch to a line with service for data.

Really number 4 is all I need mine to do. I am not a fan of rolling so many complex options into one tiny check box.
 
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