Asha uses Nokia's S40 operating system, and is recorded in Nokia Group under Devices and Services - Mobile Devices (profitable). The 501 was just launched, and several of the newer models have maps, streaming music, public transit, FB, WhatsApp, and a host of other services including exchange server access for e-mail, all on a touch screen for less than $100 w/o contract.
The Asha 501 uses a new operating system they're calling "Nokia Asha software platform". It *may* be based on S40 (which is NOT Symbian) or it may simply be a skinned version of S40. I don't know, and I probably won't experience an Asha. Yeah, I'm probably dropping my iPhone for ......... wait for it........ a little longer ......... a BlackBerry Q10.