Since I’ve had my phone for nearly ten years and dutifully backed-up -I had every number that I’ve ever added. Including people I have not talked to for 10 years. And, contacts from a former assistant. I tried for the better part of a year to delete my old contacts on my iphone and it mysteriously, to me at least, they would reappear. So, in frustration I deleted my entire contact list. Probably not the best idea and I am sure my old contacts will reappear despite my desperate efforts. I may switch to a different phone.