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

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

An IMEI number is a unique identification number that is associated with a SIM card slot on

imei slot Dual-SIM phones have two separate IMEI numbers IMEI 2: Assigned to the secondary SIM slot You could be interested in SIM

imei slot 1 imei slot 2 Step 6: Choose either Phone 1 or Phone 2, depending on the SIM slot for which you want to change the IMEI Step 7: Enter the following command in the input