Stay Connected With Us With Joy We make your communication easier, better and powerful. Visit out outlets to know more or drop in a line to us. Telsim Office Address 3-1238, International Terminal, Sydney Kingsford Smith Airport, Mascot NSW 2020, Australia Postal Address PO Box 8050 Sydney Domestic Airport Mascot NSW 2020 Customer Care 1300 TELSIM (1300 835 746) Direct Line (02) 9037 7746 Fax number (02) 9099 3699 Service Hours 10AM - 7PM Monday - Saturday Send A Message