Your iPhone SE should show your NAI as your cell number and the VZIMS.com domain. The NAI is the Network Advertising Initiative - here's their website: NAI: Network Advertising Initiative
The MSID is the Mobile Station Identification. The phone has an MDN (Mobile Device Number) which will be your cell phone number, and the MSID, which is the access number to get to your cell phone. If you have ported the number (changed carriers) or made other account changes, the numbers will typically not match.
i have an iphone 5se and recently noticed that my carrier appeared correct but you press it to get other information that doesnt . theNAI number was my number but had Vzims.com attached to it. then i press again and the MSID number is not mine ???
