Microsoft just released Dynamics CRM 2013 mobile apps for mobile devices, including Android, iPhone and Windows Phone devices!
While still it is not as comprehensive as Ipad & Windows 8 mobile applications, but the mobile apps improve the usability for users and allows them to access quickly CRM information on the go.
You can download the app directly from App Store’s:
Dynamics CRM 2013 Mobile Client for Android:
Dynamics CRM 2013 Mobile Client For iPhone:
Dynamics CRM 2013 Windows Phone App: