Dependant on my research, the final HDB hotline is 1800-225-5432 . It's really a Branch Business Provider Line that operates on weekdays from eight:00 AM to five:00 PM. Also, there are actually other contact numbers for specific solutions: * HDB Primary Line: 6490-1111 (for basic enquiries, weekdays 8:thirty AM - https://mauriced210nbn4.wikisona.com/user