Hi @HAMA, good question.   The copper is decommissioned in your area 18 months after NBN first becomes available or "Ready for Service" in your area, not 18 months after you move to the NBN service.   However, keep in mind that the copper network is not the same as your telephone number. If you didn't port or move your telephone number to TPG when you signed up for NBN, the telephone number is returned to the provider who owns that telephone number and goes into the pool to be allocated to other customers.   Edit: I see you mention the phone was with Telstra. Can you ask them if the number is still available for TPG to port?   ... View more