It depends on whether you mean Ronaldo or Cristiano Ronaldo. Ronaldo the Brazilian who plays for AC Milan has 99 as his number. Christiano Ronaldo who plays for real Madrid and has the number 9 Christiano Ronaldo from Real Madrid is number 7<333
Because he wore the same shirt number when playing for Manchester United. He switched to no. 9 when he first joined Real Madrid, as the legendary Raúl was already wearing the no. 7 shirt. When Raúl left for Schalke 04, Ronaldo took over Raúl's no. 7, thereby going back to his usual number.
Cristiano Ronaldo dos Santos Aveiro [b. February 5, 1985] wore Number 28 when he played with Sporting Clube de Portugal [Sporting CP]. He was with Sporting from 1997 to 2001 for his youth career. He continued his senior career from 2001 to 2003 with Sporting CP.
Christiano Ronaldo Has 2 famous numbers. For Manchester United and Real Madrid he is number 9 or 7. For Portugal he is number 7.This is all personal knowledge because Christiano Ronaldo is my Favourite soccer/Football Player.
Cristiano Ronaldo used to wear it, when Luis Figo was occupying that number; Nani, Manchester United's Speedy Winger, also wears that number 2011 Champions Winner, Barcelona, have Pedro, who wears that number. Pedro scored the first goal in the final against Man U.