Data is all gone after 1 day?

I have a sprint iphone 5C & I guess I didn't qualify for the unlimited everything for $65 a month, so I have unlimited text & calls but I only have 1 GB of data a month & that's $70. I just paid my bill, and not even 2 days within my new cycle all of my data is used up?! I hardly ever go on my phone unless there's Wi-Fi, I usually listen to a couple songs on pandora in the morning with cellular network while driving to school. But like do I need to turn something off or what? Somebody please help me! My bill isn't due to the 26th & my data is all gone already! I previously had verizon & 2 GB of data but it was expensive, but I hardly ever went over 1 GB of data a month with verzion? Is it something with sprint?

Turn off cellular data in your settings to stop it. Obviously you are using it some or not using Wi-Fi or it wouldn't be used up.

I would go in to Sprint and make them prove your data usage.

Pandora every day is using your data plan but with 1GB pandora shouldn't hurt as long as you don't run it all day long.

I used my phone a good amount and I got 4GB of data. It takes me about half of the month to use 1GB and i use Wi-Fi at home, my office and 2 of my friends house.

PS: Make sure your not using your phone as a hotspot and not downloading files. Streaming will use a good amount but not nearly as much as downloading. Steaming = pandora.