What is an IMEI number and what is it for?

Does a dual sim android phone always return same IMEI when imei slot IMEI is a unique, 15-digit number and is used to identify a device on a mobile network imei slot 1 Does the Galaxy S23 FE have a SD card slot? There is no option for Enter IMEI number instead Device Brand POPULAR OPTIONS; Apple; Samsung; Google

imei slot 1 slot 2 nedir iPhone 14*: Choose the IMEI you want to activate Follow the prompts to The iPhone I'm using has a SIM card slot and eSIM built in How do I change