What do you mean the phone has been cracked?

It means that your mobile phone has obtained the room, which means that the user has obtained the highest permission. It turns out that many original mobile phones are not open to users, mainly for fear that users will operate indiscriminately and destroy the system. However, you can get the highest authority after being cracked, but some software will threaten the security of your mobile phone because of the authority given by this highest authority, such as address book and so on.