I use the Contacts App on my iPhone or iPad occasionally. It works pretty well, but then it is not perfect either. Apparently, some people are reporting that peoples names are not showing in their iPhone Contacts. The phone numbers are there, but not the persons name. That kind of makes Contacts not useful. I have not had this happen to me, but if it is happening to you or someone you know, then read this article listing several troubleshooting steps.