I have a ZTE android phone, but when someone calls it says unknown all the time. How do I change it?

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I have a ZTE android phone but when someone calls it says unknown all the time please help
 

B. Diddy

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Welcome to Android Central! Does your plan include Caller ID? If so, open your Phone app, tap Menu>Settings>Call Settings, and look for the Caller ID option to make sure it's turned on.

Are contacts that are in your Contacts app also showing up as Unknown when they call?