In most systems, the MAC address is considered a unique identified, or part of it. Depends on what you are talking about. For example, in Windows, in order to Authenticate your Windows, it uses a 'unique identifier' which is made up of several things, including your MAC, your motherboard, your hard drive ID and or size, and several unknown things. If you are able to change this, then Windows will no longer consider your Windows as authenticated. And it may shutdown your PC every hour, like on unregistered trial versions of Windows Enterprise - I am not sure.
On Android cell phones, your unique identifier is the UMEI number, which you can see in Systems. Don't think you can change that, but then my knowledge of Androids is limited.
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