iphone 6 gps mapping voice issues and incoming text when conntected via bluetooth
So I'm new to the iphone group. I just switched from Windows Phone to the iPhone 6 and am having issues in two areas, both related to Bluetooth. First - using mapping software for gps works fine, but when connected to my car stereo via Bluetooth, the mapping software wont announce the upcoming turns. I have tried this with both the Apple maps and Nokia Here/Drive app. Second problem I am having (maybe it's just a limitation issue) is that with my Windows Phone, Cortana would read incoming text to me and allow me to respond hands-free. The iphone wont do this...is this a settings issue that I am not aware of or is this not a possibility right now? Thanks in advance....
iPhone 6, iOS 8.4, null