Blacklisted Checker By iMei

What is the blacklist and how to check the device can get blacklist?
There are a couple of ways that might get your device block. For example it can be reported as lost or stolen or the bills havenot been paid for this IMEI number The network adds such IMEI to the so called blacklist. Every signal to the device is being blocked, you cannot receive or make any calls, or send messages.
For Example
iPHone
SamsunG
Motorola
VivO
Blackberry
OppO
LG
And all Types and models of Mobiles