If your device is a dual SIM device (like X1-01 and C2-00), which means both SIM cards can be connected to the network at the same time, your device has two IMEI numbers.

If your device is a two SIM device (like C1-00), which means only one SIM card can be connected to the network at a time, your device has only one IMEI number.

Only sim 1 IMEI is used to check for warranty.