how is it if I buy a mobile from say a company interstate it arrives usually within 48hrs Im in Tassie and have bought a few phones this year for family from large dept store that has online options and they have always arrived within 48hrs of placing order   I mean I know the battery issue with AP often wondered about this

A lot of courier companies have an overnight road service for the delivery of items that cannot travel by air.

Australian Air Express has an overnight road service between capital cities (on the east coast, not sure what the timeframe is for WA) and it is used extensively by mobile phone dealers.

The trucks arrive here in Sydney very early in the morning, in time for the local delivery drivers to take them on board for delivery that day.

So yes, overnight delivery of mobile phones from interstate is not only possible, but done every day of the week.