"syncing" old (no SIM) to current phone setting and home screen?
i would like to set up my older iPhone(s) so that they "sync" to my current iPhone that has a SIM and which i use to make phone calls. meaning i have two older phones that each have access to wifi and i like to bring ONE of them with me when i travel in case i lose the phone i currently have. in that case i can go get a replacement SIM.
what i would like to have happen is that i put the SIM into my old phone and it has all the exact same settings like Home Screen, texts, emails, phone calls and voicemails etc, etc without having to completely reconfigure everything including the HOME SCREEN.
csn i just ripe the old phone(s) back to factory settings and sync to my iCloud account?
and then if i put the SIM i am using in my current phone into this phone it will look like all my other phones?
or what do i need to have this happen?(!)
THANKS
iPhone 6, iOS 12