They both used to work completely fine, both enabled.
But now they only work when enabled individually, so I basically am locked to one SIM at a time. If I turn on the physical SIM (SIM 1) while my Esim (2) is already on, it practically disables SIM 2, forgets it's number and no longer gets any signal.
Just sim 2 on, works perfectly, just sim 1 on, doesn't work great, but is still there and recognised.
2. Check SIM Manager * Settings > Connections > SIM manager * Ensure a default SIM is set for calls/data (switch between the two if one does not resolve)
3. Carrier Conflict * Particularly if both SIMs are from the same provider * Engage your provider's support line if so
4. Clear Cache: * Settings > Apps > One UI Home → Tap Clear cache * Power off the phone * Hold Volume Up + Power until Recovery Mode appears * Use volume buttons to highlight “Wipe cache partition” * Press Power to select * Highlight “Yes”, press Power * After it completes, select “Reboot system now”
