I have a XA2 dual SIM with Dutch and German SIM cards. When I insert both cards, I can not call with the Dutch SIM “geen netwerkdekking” (no coverage?). It used to work fine, but stopped working somewhere last year.
Both cards work fine in both slots when I insert only one of them. So it doesn’t seem to be a hardware problem. I also tried switching SIM 1 and 2, but to no avail. For what it’s worth, after restarting the phone and unlocking both SIMs, they both light up for a couple of seconds until the Dutch one greys out…