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Also known as Verified Caller ID.Also known as Verified Caller ID and Trusted Calling. Caller ID spoofing is used by robocallers to mask their identity or to make it appear the call is from a legitimate source, often a nearby phone number with the same area code and exchange. They have been taking advantage of VoIP technology however now they may retreat into using FCC exempt telephone carriers so that they can continue to spoof their calls using fake or other people's phone number on the caller ID.