In a blender reduce mango pieces into a puree. Put the mango puree in a saucepan and cook over medium heat for 15 minutes to reduce a little. Let the mango puree cool down.
In a large bowl mix the mango and sweetened condensed milk together and set aside. Beat the cold whipping cream until it is firm. Take 2 tablespoons of cream and mix with the mango mixture to relax a little. Then add the rest of the whipped by mixing gently.
Pour into a bowl and let freeze for at least 10 hours in the freezer. Get out of the fridge 5 minutes before serving, make balls and enjoy.