The device that is using the SMS-capable phone number you provided when you first set up iCloud Keychain. A verification code is sent via SMS to this phone number. If you can't access this number
I can not access this number because I changed it. How can I change my new telephone number?
iPhone 6 Plus, iOS 8.3
Well, what do the instructions say if you cannot access the number?
"Approve with security code" the systems say Enter the verification code sent to +66 ••-•••-••58
And I changed telephone number I don't know how can I update my telephone.
From Frequently asked questions about iCloud Keychain - Apple Support :
If you can't access any of your other devices that are using iCloud Keychain, you can still set up iCloud Keychain on another device if you have these items:
You might also want to read:
Can I change my telephone on icould keychain?
