options for developing an existing web client for mobile

we have a flex based app with TCP servers and asmx services that support it and we want to develope a similiar client for iPhone and android (in the future- maybe WP7) as i see it we have the following options: 1. Cross platform of such kind 2. developing for each mobile what are the disadvantages and advantages for each met开发者_开发百科hod considering time,syntax learning and future support. Thanks.

Probably late for the user, but it might be a good reference for the future: here you can find a good webinar + slides explaining the three main options (native, hybrid, web). Then towards the end it also expands on some aspects to consider when making the choice.