Why does my phone have two IMEI number and I have one SIM card?

Fairphone 5: IMEI & Serial Numbers of the Phone and its Spare Parts imei slot 1 and 2 To have 2 usable, active mobile numbers, a smartphone must have: At least 2 SIMs: Each SIM is identified by an IMEI code Dual SIM Dual Standby imei slot 1 Scroll down Under IMEI , the unique IMEI number of SIM 1 is displayed Return to the Start screen

imei slot 1 If a phone has two SIM cards in both slots, then the IMEI number of the first slot is retrieved by default, and if a phone has only one SIM card