This function validates US phone numbers without requiring the +1 country code prefix. It accepts various input formats (like 123-456-7890 or 1234567890), verifies the number's legitimacy using the NumVerify API, and returns comprehensive information including carrier details, geographic location, and line type.  

The validator intelligently handles different input formats, extracting the 10-digit number and properly formatting API requests. For valid numbers, it provides a user-friendly validation message with formatted number and detailed metadata. For invalid inputs, it returns helpful error messages guiding users toward proper format.  

Designed for Voiceflow projects requiring US-specific phone validation, this function streamlines user experience by eliminating the need for international formatting while maintaining robust verification capabilities.