This format was created by Nokia for use in its proprietary phones. A bitmap image was used to transfer image files between devices over a wireless connection. It was mainly used when exchanging multimedia text messages that support inserting pictures.
WBMP is a bitmaps wireless application protocol. Files with the extension .wbmp contain bitmap black and white images. In WBMP format monochrome images are in pixels. Pixels are presented in the form of units, are stored as white and pixels, represented as pairs are stored as black. WBMP images are used in a variety of mobile phones.