HDB customer service hotline is designed to assist with questions related to flats, applications, and estate matters. The hotline number is 1800-225-5432, available Monday to Friday from 8:00 am to 5:30 pm. Common requests include information on buying a new flat, applying for grants, or checking the status of applications. https://hdbhotline124913345.blogchaat.com/36683952/hdb-hotline-12-49