The problem of unlisted phone numbers can be partially resolved through the use of random digit dialing.

Question

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Random digit dialing involves dialing telephone numbers at random, without any predetermined list or source. This technique can potentially reach unlisted phone numbers as well as listed ones. However, it may not be a complete solution, as some individuals may have opted out of receiving unsolicited calls or may have other measures in place to block unknown or unwanted numbers.

The Problem of Unlisted Phone Numbers Can Be Partially Resolved