Which code is associated with CDMA phones, limiting provider changes?

The code associated with CDMA (Code Division Multiple Access) phones that limits provider changes is the Electronic Code. In a CDMA network, devices are authenticated using a unique Electronic Serial Number (ESN) or a Mobile Equipment Identifier (MEID). This identifier ties the device to a specific mobile network, making it difficult to switch carriers because the network needs to recognize the device before it can provide service. This system is designed to enhance network security and user authentication.

In contrast, SIM cards, which are commonly associated with GSM (Global System for Mobile Communications) networks, allow for easy switching between providers as they store user information and are transferable between devices. Wireless standards refer to the protocols and technologies that govern how devices communicate over a wireless network, and a network address generally helps in identifying devices within a network but does not specifically limit provider changes as the Electronic Code does.