3 Answers, 1 is accepted
I am afraid most mobile browsers do not support scrollbars out of the box. We have a TouchScrollExtender for some of the controls (including RadGrid) that add custom scroll indicators while the content is being scrolled so this provide a better visual representation, but other than that initial scrollbars are not visible.
All the best,Marin
the Telerik team

I'm not sure how I missed that being the general behavior - I really thought I'd seen them, but of course I can't find any examples now.
Can you specify what you mean by scroll indicators with the TouchScrollExtender? On the demo page, I can scroll, but don't see any indicator that the grid scrolls.
Thanks again.
Indeed the scroll indicators are not visible on the demo most likely because of some of the styles on the page which do not cooperate very well with the touch scroll extender on mobile device. If you put the grid on a clean page there shouldn't be such problems. I am attaching a sample page where you can see that while scrolling up and down the scroll indicators are shown on the right side of the grid where normally the standard scroll is placed.
All the best,Marin
the Telerik team