Samsung G600 Cannot hear any tones

Adding a personal Caller ringtone
You can make any kind of sound a personal ringtone for your contacts. First locate the sound you want to assign by following these steps:

• From standby mode, click Menu
• Highlight My files and click Select
• The sound will be in either the Music or Sounds section. Highlight the relevent section and click Select (or just press 3 or 4 for quick access)
• Navigate through the subfolders in either section to find the sound clip or MP3 you want to assign. Highlight the file and click Options.
• Highlight Set as and click Select. When the pop-up menu appears, highlightCaller ringtone and press Select, or just press 2.
• You'll be taken to your contact list. To assign a contact to the tone, highlight their name using the up and down nav keys and press the centre selection key. You'll see the confirmation message 'Changed' confirming the change.
• Click the red End call key to return to standby mode.