SIM card for data transfer by default is not saved

[vin10]

Why SIM card for data transfer by default is not saved (Sony Xperia Z3+dual)?

[Hampus]

Hi,

Could you please elaborate? How do you mean by data transfer? What kind of data is not saved?

[vin10]

No, automatically there is a change of the SIM card selected for transmission to the mobile traffice

[Hampus]

Does this happen when you do something specific? For example restarting the phone, changing some settings or removing the SIM-card?

[vin10]

No, nothing specific do, "jumps" randomly.