I have 2 SIMs: The first one has only data and can’t make calls, the second one can make calls but doesn’t have any data. With the “backup calling” feature, I can make and receive calls over the cellular data of the first SIM if the second is offline. This is useful for me because my phone doesn’t have dual SIM dual active so cellular data stops working if I am making a call. Backup calling requires the phone calls sim to have no signal which I can force by limiting the SIM to 5G. Obviously doing this is not ideal as the phone searches for 5G signal, can’t find it and drains its battery quickly. The weird part is the phone supports 5G and so does the carrier, my account (?) doesn’t support 5G because I don’t have any plans on the SIM. Forcing 2G or 3G won’t work, those are still available where I live.
So is there a way to use backup calling without taking one of the SIMs offline? Or is there a way to take 1 SIM offline without making it search for an unavailable band? I don’t want to lose cellular data each time I receive a call or drain my battery quickly. Phone is Galaxy A34 5G running Android 14, not rooted
I’m not exactly sure how Backup Calling works (I don’t think my phone has that feature) but would “Ask each time” be a sufficient option for you? That’s how I usually set things up when I’m traveling and have a travel eSIM.
Ask each time lets me pick the SIM used for the call. I always use the second SIM, the first one doesn’t support calls. What I want is routing calls with the cellular data of the first SIM. On my phone backup calling is tied to SIM switch, when one is on so is the other. SIM switch is automatically swapping cellular data to a SIM if it receives a call (which I can’t, the calls SIM has no data)