In case it's not clear, you do this without jailbreaking by modifying the plist which is stored in your iTunes backup on your PC then restore the backup, thus changing the name... Make sure you perform a backup just before you change the plist, then restore the changes immediately. That way you won't lose any other data.
You can use PC tools like iBackupBot to mess with your backup files... Just be careful. Don't go changing anything else unless you know what you are doing!
You can change carrier name without jailbreaking. The carrier name is simply set by a plist file.
Go to /System/Library/CoreServices/SpringBoard.app
Open up N81AP.plist and change the "device-name" to whatever you want as your Carrier text.
You can change carrier name without jailbreaking. The carrier name is simply set by a plist file.
Go to /System/Library/CoreServices/SpringBoard.app
Open up N81AP.plist and change the "device-name" to whatever you want as your Carrier text.