Make sure you read the FAQs sticky and search before posting a new thread, most questions have already been answered.
The Sprint 700wx does not support A2DP, or basically music over BT, stock. However, hannip over ar Treocentral figured out a way to port it from the Verizon 700wx.
Check this thread for more information, or the Treocentral thread for even more info...
http://www.ppcgeeks.com/a2dp-on-the-...ues-t3038.html