MobileZX is a 48k ZX Spectrum emulator for mobile devices with support for J2ME MIDP2.0. It is oriented to devices such as PDAs and mobile phones.

Release notes:

A new release of the mobile phone ZX Spectrum emulator, MobileZX has been issued. This is a minor bug fix which improves the contrast between normal and bright colours. Thanks to Anton Belenki for spotting this issue.

http://sourceforge.net/projects/mobilezx/