BenQ S700 - Manual (Page 147)

Menus 131
Phone Memory/miniSD Card in this Music menu, or choose the
menu: Media Center > Memory Settings.
Scroll to the audio file you want, and the phone will start playback.
You can also press (Option) to organize the audio files using the
available options, which are identical to the ones for the video library.
Memory Settings
You can store images, music and video clips either in the phone
memory or on the miniSD Card. Select the desired memory for use.
The memory you have selected here will also determine the images,
videos and audios that you can access in the Media Center menu.
Memory Status
Here you can check the memory status in the phone and on the miniSD
Card.