How do I change my telephone number?

Get help using iCloud Keychain - Apple Support

1 -

On your iPhone, iPad, or iPod touch, tap Settings > iCloud > Keychain > Advanced. (In iOS 7, tap Settings > iCloud > Account > Keychain.) Make sure the phone number under Verification Number is correct. If not, enter another phone number.

2

On your Mac, choose Apple menu > System Preferences. Click iCloud, then click Options next to Keychain. (In OS X Mavericks or earlier, click iCloud, then click Account Details.) Make sure the phone number under Verification number is correct. If not, enter another phone number.

On your iPad or iPhone are you going to System, then iCloud, then Key Chain options? You should see something like this

i lose mr telephone number and i need to receive codes in another number

i need to use my Apple Id in another iphone and send code to the telephone Number and this number i do not have it now

i have Apple ID but i lose telephone number which receive SMS by it

How to use my Apple ID?