Motorola V400
Name Banner for V400
First, go to Personalize in Settings, and you can change the greeting (which shows whenever the phone is powered on) to your name. Probably not good enough.
You could also modify a wallpaper or screensaver JPG or GIF to have your name on it (using Photoshop or whatever).
Or, if you wanted to put some work into it, you could hack your phone and change the outer LCD text to your name (which would be displayed when the phone was open).
Another hack you could do would be to replace the provider name (Cingular or whatever) or the date/GPRS below that on the main screen to your name; again, a fair little bit of work involved.
Of course with those last 2 hacks, your name would pretty well be permanently on the ...
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http://xlr8.us/hofo/ »
As I mentioned before, this site is a great compilation of pretty much all known hacks you can apply to a VXXX phone. You will of course need a data cable, P2KMan installed, and a hex editor.
The site actually covers both of these possibilities. Scroll down his page until you get to "Special Cases" a fair ways down. Under that, the first is "Custom Outer LCD Text" which explains how to change that. The second is under "Date/GPRS Display Under Carrier Name", where it mentions changing it to your own custom text.