The abbreviation " VPN " has slowly become established among average Internet users, which is certainly good, but the problem is that people have started to see VPN as the ultimate solution to all problems.
IMEI is an abbreviation of "international mobile equipment identity" and each mobile phone should have a unique IMEI number. You cannot change this number with the operator, but you can temporarily change it on your device. It allows the operator to accurately identify your device and thus enable/disable network services. Also, you can use the possibility of changing the IMEI number, at least for a short time, if you know exactly what you want, but I leave those ideas to you because this is an educational article.