You just need to know what to do, and do it quickly. Before iOS 16, you'd actually need to restore your iPhone from a backup to retrieve the message. Thankfully, this isn't the case anymore ...

So, suddenly, finding your iPhone contact list empty or numbers missing can scare the hell out of you. Fortunately, a way exists to restore iPhone contacts via iCloud if you accidentally deleted them.

To turn off an iPhone X or later, follow the instructions below ... your phone may be able to reconnect with your service provider to restore service on your phone so that you can make calls ...