NEED HIGH-RESOLIUTION PHONE GRAPHICS FOR MOCK-UPS. DO ANY GRAPHIC DESIGNERS HAVE HIGH QUALITY PICS?
If you just want to display it on your phone only, look your phone up in PhoneScoop's database and get the screen resolution.
Then get a vector (eps or illustrator) copy of your logo, open it with Photoshop and paste it onto a blank document that matches the pixel dimensions of your screen. Save it out as a JPG at a medium setting to make sure you don't overrun filesize limitations.
Also, note that certain phones (I want to say Nokia 3595? I forget) have non-square pixels so you'll need to either
a) use Photoshop CS/CS2's non-square pixel support and a format that supports it (png -- and not all phones support png) to compensate;
b) distort your artwork in the opposite direction by an eq...