Talk:Germany/@comment-179.178.136.42-20150904155314/@comment-24682153-20150905214851

I agree. you can buy this SIM card in Germany and either buy a domestic package first and activate the Cross option when leaving for Austria or you can start on Cross from the beginning as it includes Germany too. The offer can be found here Euro4

But it depends on what you call "heavy data usage". For any volume above 1.2 GB within that month, you should buy local SIM cards in the respective countries instead.