Bluetooth headphones & data use?

[Blackpearrl]

I am trying to figure out whether using my bluetooth headphones to listen to mp3s & other downloaded content (ie, not streaming) eats up my data use. Specifically, I am talking about when I'm running outside & therefore, not using WiFi. Anyone? Thanks.

 

[rjl2]

Bluetooth is between your phone and whatever Bluetooth device is connected to it (speaker, headphones, car). It doesn't use mobile data unless whatever you are doing also uses mobile data. Since you're talking about media locally stored on your phone, no data should be used.