Is there a “mac address” on the mobile phone that makes each mobile phone different?

Question

In other words, whether there is an identifier for each mobile phone - this makes it different.

Two phones cannot have the same identifier. (I'm talking about smartphones ... Android, iphone, etc.)

Answer 1

Phones have MAC addresses on WiFi interfaces, but the cellular interface has something called IMEI , which performs roughly the same function.

Answer 2

It should be noted that IMEI is associated with a physical device / phone, unlike IMSI, which is associated with a SIM card and, therefore, with a client account. You don’t know how you could access from the application running on the phone, assuming what you are doing.