A standardized numeric score representing the quality of a phone number. This score, ranging from 0 to 1, is designed to harmonize different phone number quality models provided by data owners into a single scale. A score of 1 denotes the highest quality or confidence level. This score is not a probability but a convenience attribute for comparing subjective quality ratings across various datasets. Users should interpret the score cautiously, as it represents self-described quality assessments from data providers.