How to change the contact phone number associated with keychain
When I try to log in to keychain, it asks for my 4 digit security code . After I enter the pin, it says that it has sent a verification code to my phone number, but the n that it shows that the code is sent to is a old invalid telephone numbe and so I cannot get the code . Please help me change that phone number
iPhone 6 Plus, iOS 11.4, Keychain