You can give your vote if you want to have a switch button in the Telerik UI for ASP.NET AJAX suite. See the attachment for more information.

When building Responsive webpages the Telerik navigation control to use is RadNavigation because it properly resizes when the screen is rotated unlike the RadMenu.  

However RadNavigation doesn't seem to have a way to see my current location within a website which is where the breadcrumb come is.

The addition of breadcrumb integration with RadNavigation would benefit Responsive web designer using the Telerik controls.