What is cid number?

CID (Carrier Identification) Number is a unique identification number given to mobile devices by their respective wireless carriers. It is used to identify and authenticate the device on the carrier’s network. The CID number is often used by carriers to restrict access to specific services or features for certain devices. Some common use cases for CID include the activation of a new device, unlocking a device for use on another carrier’s network, or restricting access to certain services for non-authorized devices. The CID number can also be used by customers to check if their device is compatible with a particular network or to troubleshoot connection issues.