Here is the Blackberry 8530 bluetooth file transfer procedure:

>>>You can only send media files that you added.
Before you begin: To perform this task with a paired Bluetooth® enabled device, you must turn on Bluetooth technology.>>>
KB03391-How to pair a BlackBerry smartphone with Bluetooth enabled devices

Send a media file
1.On the Home screen, click the Media icon.
2.Click a media type.
3.If necessary, click a category.
4.Highlight a media file.
5.Press the Menu key.
6.Perform one of the following actions:To send a picture file, click Send or Share. Click a message type.
To send an audio or video file, click the send option for a message type.

Receive a media file using Bluetooth technology
Before you begin:To perform this task, Bluetooth® technology must be turned on and your BlackBerry® device must be paired with a Bluetooth enabled device.
1.On the Home screen, click the Media icon.
2.Click a media type.
3.Press the Menu key.
4.Click Receive Using Bluetooth.
5.Send a media file from the paired Bluetooth enabled device.
6.If necessary, click Yes.
7.Click Save.

Resources
BlackBerry: Support

I just bought a blackberry curve and i tried to have my friend bluetooth me some ringtones from her blackberry curve and it kept giving her the error message "failed to find service." It pairs up just fine but it wont send or receive files from either device. Does anyone have any ideas? They are both BlackBerry curve 8530.