The IMEI will never change, this is static to the device.
The SIM & Phone number are reported via the SIM that's inputted, and refreshed usually by the network once you begin placing and receiving calls, voice mails, etc.
What ever active phone number is on the SIM card in the phone, is the one that will be used to make and receive calls, regardless if your seeing something different, on a stock, unaltered phone.
SIM card is the master, phone is the slave.
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