If you sync the phone with iTunes before, you can go to iTunes>Preferences>Devices to restore them or use [Misafirler Kayıt Olmadan Link Göremezler Lütfen Kayıt İçin Tıklayın ! ] tool to extract iTunes backup, using the third-party tool, you can choose the contacts you needed to restore, it also can [Misafirler Kayıt Olmadan Link Göremezler Lütfen Kayıt İçin Tıklayın ! ] directly, so if you don't make a backup before, you still can recover lost contacts.