Here's a way to replace ATT on the HomeScreen for the Smartphone Home Screen.
I used XML Notepad 2007.
1. Retrieve a copy of motorola.home.xml from the phone.
Using AciveSync's "Explore" function you will find that there are many .xml files in the main <Windows> folder, including cingular.home.xml and motorola.home.xml.
(In the <Application Data/Home> folder of the stock AT&T Q 9h you will find cingular.home.xml also, but not the motorola.home.xml.)
2. Open motorola.home.xml in XML Notepad.
3. Rename the text in the "tile" from 'Smartphone' to something else. (In this example, 'Smartphone - custom')
4. In the "carrier" plugin change the label type to 'text' from 'element'
(Right click 'Carrier"...Change To ---> 'Text')
5. Replace '<carrier />' with the text of your choice. (Such as "myphone"')
6. Save the file in another location on your PC. (In other words, I retained the motorola.home.xml name.)
7. Copy the new motorola.home.com to the <Application Data/Home> folder.
8, Cycle POWER.
9. Go to Settings and select your new Home Screen Layout.
Edit: All credit of this guide goes to GraemeCR and to see the original post complete with screenshots please visit
http://www.maximus.ws/forum/showthread.php?t=823