I was finally getting around to reading my 4E Essentials books, specifically the Heroes of the Fallen Lands Wizard, the Mage. After discovering the nice hybrid of Vancian and 4E Core magic, I noticed that a Mage, regardless of school, gains 3 Cantrips at 1st level.
What I'm getting at is this; Does a 4E Mage gain more Cantrips as they progess in level or do they only know the 3 Cantrips from levels 1 to 30?