I've tried over and over to send images from my email to my phone (the damned thing does not have a USB cord available to buy...), and every time that I do it, it seems that it is a few pixels off from what it needs. I'm always getting white lines around the background. Since bit transfer isn't free, this starts to add up after a while.

Does anyone know the correct size in pixels that the wallpaper needs to be?

According to manufacture's specification, the useable graphics area of the screen is 128x160. I'm going to assume that you already knew that.

If you already made a wallpaper in this size how about cutting down 10% smaller than your current size? My reasoning is that maybe your size is too big for the graphics area that it's shrinking to fit the screen.

Or perhaps 128x160 is the perfect size. Again, what is your current wallpaper resolution size?

If your phone will let you, you could always email one of the default backgrounds to your PC and edit that, then it should be the perfect size.