Share your experience!
my sola is 3 month old and my speeker is not working now..!!!
i can now call only using loud speaker or through headphones..!! 
I would first suggest trying a software repair to the device to try resolve this issue. I have supplied these instructions below,
1. Before you start you have to download the PC Companion software from http://www.sonymobile.com/gb/tools/pc-companion/
and install it on your PC.
2. Once installed on your PC, double-click the PC Companion icon on your desktop to start the update.
Note! For some models you will be prompted to do a backup prior to the update and then restore.
3. Install and open PC Companion then select Support Zone.
4. Phone Software Update.
5. Start.
6. Repair Phone
7. Continue
8. Accept data removal
9. Next
10. Wait for prepare
11. Select Phone
12. Follow the connection steps
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