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Gif or BMP?

Our monochrome mobile screensaver are available in GIF- and BMP-format. Whether you will need GIF or BMP depends on which format is supported by your mobile. The quickest way to find out is probably a Google search using the name of your mobile along with tearms like "supported formats." Also, you may check your mobile's users manual to find out (specifications.)
Older mobiles, for which these screensavers have been designed, are more likely to support BMP. If your mobile supports GIF, though, this should be your preferred option.

Have Fun.