Missed Call Notifications Says "Wireless Caller" Instead of Name or Phone Number.

What's shown is the caller ID. Some phone companies send "Wireless caller" as the caller ID for cellphones. Your phone is displaying what it's being sent - there's nothing you can do about it. (I've been called by states and cities - Reno NV or Utah as the caller ID. And there are apps that let you set your own caller ID, which isn't illegal unless done for illegal purposes [like defrauding someone].)