WAP allows you to use a graphics format called WBMP. This is a 1 bit (either black or white) version of the BMP format. To use a graphic with WAP, you must convert it into wbmp format.
Keep in mind that wireless devices vary greatly and generally have very small screens. When using WBMP, you should observe some general guidelines. An image should not be larger than 150 x 150 pixels. On some screens, even an image of this size would take up more than the entire screen. Furthermore, all graphics are limited to a size of 1461 bytes, because of WAP phone memory limitations. Be sure to include the "alt" option in the <img> tag to accommodate WAP devices that do not display graphics.