I love listening to music and I love Pandora Radio. But I am new to Android OS and I have chosen the 200 MB Data Plan. Which I think is sufficient because I am always connected to WiFi whether it is at school, work or home. But Pandora uses a lot of data usage so I have a couple questions about it. Will it still use data even if it is not in use? If I am already connected to WiFi will it use WiFi? And is there an option on it that will only connect to WiFi networks? Thank you for your help!