I have tried entering my user ID as well as my name on the iPhone setting page as well as the new info about the NETID@neiu.edu address. The
Sounds like you need some hands on help.
A support person from Helpdesk will be contacting your shortly.
Added 07/24/2013: Some people have been reporting issues when setting up their IPHONE for NMAIL. Attached is some new and much improved documentation - hope this will help !