[BB] Spotify with capped data allowance

[Emiel]

Hello, i have since 11 days spotify and i like it. I saw that there is a app for mobile phones. 

I hot the BlackBerry Bold 9780. With a subscribe for internet - SMS and Call i got 1000MB for internet. so my question is: if i listen music with spotify on my mobile will it cost me MB's from my internet subscription or not. and if it does what is then the best option to still use it probably Wifi?

Thanks

Emiel