I've had my C905 just over a year no problems until now, when i use my handset, i cant hear anything from my internal speaker, only if i put phone on loudspeaker, phone itself in good condition, any easy solutions.
i had this problem and found an easy and cheap solution to the problem, its a common fault with these handsets which sony will charge a small fortune to repair when you can quite easily do it yourself.
If you have skype then you can contact me there where i will talk you through what needs to be done.
SKYPE NAME - dai262002
FACEBOOK - david w phillips
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix mobile phones.