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OKay, so the only way to restore an accidently deleted contact from your iphone.......is to restore it from a BACKUP.
So, the question now becomes.....are you doing backups?
Most obvious backup, and comes standard on all iPhones, is the iCloud Backup.
But there are 2 other methods to backup as well, iCloud is the just the most popular.
So....again......the questions now becomes.......are you doing backups?