Do we have any OEID client (read studio) application (or seperate ear) for mobile devices?
Otherwise can OEID studio be effectively used on mobile devices using the browsers? If yes, how good is it to recommend the same to the customer?
Any plans from oracle to provide the mobile app tool , similar to the one on commerce side on OEID to let business user do the analytics on the go?
Yes, you can though I'm guessing you'd have a hard time getting a "bug fix" for a mobile-specific issue.
I use Chrome on my Android phone and, though the experience is obviously desktop optimized, it works great. I can't speak for every out of the box component, but our applications, where use a lot of our own components work really well.