Is it a live demo phone or a retail model? If it’s a demo model it’ll have all of the hardware but the baseband, so it cannot make phone calls and naturally lacks an IMEI number.
If this is a retail phone with a baseband, someone changed the IMEI and got the procedure wrong. This isn’t something most end users can fix, so the phone part is usually considered “dead” when they get this wrong. It is possible to recertify the IMEI and restore it, but the certificate and IMEI data both need to match and it’s probably long gone. I’m not going to find or post any links on how to do this (I don’t want to have to answer if my answer is used to resell a stolen phone). If you know how, you know where to start. If you don’t know what JTAG or ADB stands for without using Google, you’ll kill the phone, or any window to “recertify” the device’s IMEI and fix the issue!
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