The following looks at how the iPhone automatically detects Australian based phone numbers, and how you can explicitly define them. You can read more about this in Apple's iOS Developer Library.
By using the tel:
protocol, you can instruct the iPhone to respond to a click by making a phone call.
- +61 8 8222 2222
The following should automatically be auto-detected by mobile Safari and turned into clickable links (on an iOS device only).
- +61 8 8222 2222
- +61 8 82222222
- +61 882222222
- +61 421 000 000
- 08 8222 2222
- 08 82222222
- 8222 2222
- 82222222
- 1800 000 000
- 1800000000
The following either aren't detected, or aren't detected appropriately.
- +61 (0)421 111 111 (standard Australian mobile)
- 13 22 22