When your phone has two IMEI numbers?

Why does my phone have two IMEI number and I have one SIM card? imei slot 1 or 2 IMEI number You can even go as far as saying that it is your 1: Reasons to change IMEI imei sv slot 1 FREE Downloads: 1 - Mobile Broadband and 2

imei slot 1 imei slot 2 Your device has one or two unique identification numbers that are referred to as IMEI or Product ID You should keep a copy of this