You can contact the Housing and Development Board (HDB) hotline at 6490-1111 for any queries related to HDB Flat Eligibility (HFE) letter . Please note that there is an ongoing scam involving scammers impersonating HDB. The scammers may appear to use the HDB hotline number to appear legitimate. HDB will not request sensitive information over the phone. To protect yourself, do not divulge your information without first verifying the authenticity of the caller. If you receive any suspicious form of communications claiming to be from HDB, please contact HDB via their e-Feedback Form or call them at 6490-1111 1.