IMEI for dual-sim phones - Which one is picked by Collect?

Yes One UI 5 activated the second slot normally used for SD cards to be used also as a second sim Hence the two IMEI numbers

Your device has two IMEI numbers because your device can utilize two SIMs This is accomplished with one

imei slot 1 or 2 Slot 1: 5G4G3G2G Nano SIM card Slot 2: 5G4G3G2G Nano SIM card IMEI 123456789012345 Brand Apple Device Model IPhone 14 Pro Variant

imei slot 1 No, you need to enter only one of them into the IMEI number field More information visit Samsung FAQ page for exchange & upgrade