Guess The Number/Bulls & cows

Your challenge is to find out the number

Bulls and cows is also known as Mastermind, 4digits, guess the number ... The goal of the game is to guess the number with a minimum of attempts.
In the beginning your phone generates a random number, and you try to guess this number. The opponent responds by announcing the number of matches:
If the matching digits are on their right positions, they are "bulls", if they are on different positions, they are "cows".