Peel the mango, remove the pit, and dice the flesh to measure about 2 cups if you are using fresh mango. If using frozen mango, measure it directly from the bag.
Add the diced mango, plain yogurt, milk, honey, ice cubes, ground cardamom, and lime juice to a blender in that order.
Blend on high speed until completely smooth and creamy, 45–60 seconds, stopping once or twice to scrape down the sides if needed.
Check the consistency; if you prefer a thinner smoothie, blend in a little more milk a tablespoon at a time until it reaches your desired thickness.
Taste and adjust the sweetness with a bit more honey if needed, blending briefly to combine.
Pour the mango smoothie into two chilled glasses and serve immediately while cold and frothy.