Phone number formatting
There should be a drop-down choice in formats the provide a formatting especially for phone numbers that can cope with +61 without trying to treat it as an equation and leaves the leading zero as is. Also you can click and dial from there if you have a phone function on you PC like cisco jabber.
formatting should assume your number is in the same country as your timezone. It should offer some choice of format i.e. +61 456 654 456 vs 0456 654 456.