Code to ring England from Norway?

First of all, the physical location of the mobile you are trying to call, does not affect how you dial its number. You dial the mobile the same way whether it is at home or halfway around the world.

Australia is country code +61 and mobile numbers begin with +61 4.

(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, and many other countries use different prefixes.)