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This may help you, I dont know if the Esteem will have tho
On the Ascend there was a file in the Data folder called eri.xml and you could change the carriers name inside that xml. When you changed it in there it displayed it on the lock screen, the status bar and changed the carriers name in the about phone section. I made it all read MetroPieceOfShit.
Be VERY careful modifying that file. If I remember right there was a whole process to re-signing the apk after putting it all back together again, and being an important one for booting up, I don't recommend changing it until we can make a nandroid backup.
There's a whole app out there on the market designed to re-package changes to the framework back together properly. I'll look for the name.
lol... my friend brought his ascend over today. Looks like a little box of raisins next to the esteem