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No, its only public if you choose to disclose it. Phone numbers are PII (personal identifying information) in regards to the GDPR.

• tripa 7y ago
  Sorry for the slight pedantry, but PII is some American thing. GDPR deals with "personal data". It's playing on words until you find out the PII definition isn't the one that's used to settle GDPR claims.
  • inetknght 7y ago
    You're cutting hairs here. Phone numbers are protected under both European and US privacy protection laws.
    • tripa 7y ago
      I knowingly am. :-( Parent post insisted on the acronym, that triggered my consistency response reflex.