APN for CallYa voice & data SIM: web.vodafone.de The "mein Vodafone" app is a good way to manage your CallYa card, but it's only available in the German Play or App stores or from alternative stores Website in German only: http://www.vodafone.de/ O₂ Deutschland (by Telefónica)...
Yes, you can get an Australian SIM card as soon as you land. Most airports havemultiple network operator stores and stands, so you can take this time to explore their offers. Sydney Airport, for example, has Optus and Vodafone shops.² Best prepaid SIM cards for Australia Here are some ...