It certainly isn't unusual for there to be a proportion of content which isn't indexed, but such a high proportion does suggest problems with your site. Setting aside the mobile site for a moment, as a starting point I'd suggest:
- Check all URLs listed in the Sitemap are definitely valid (run the .xml file through an HTTP header checker, ideally).
- Look at the Index Status tool in GWT (Health > Index Status, click the Advanced tab). Are you seeing large amounts of content showing as "not selected", "blocked by robots" etc.?
- Do you have any content duplication issues?
- Have you had any messages from Google regarding suspicious back links, etc.?
The mobile site is more perplexing: that nothing is indexed suggests as serious problem somewhere, and a lot depends on the site configuration. Try the basic checks above to rule out simpler problems first.
If you can, share the site(s) address(es). Much easier to help if we can see the site first-hand.