When I Call Some1 Or Recived Some1s Call I Can't Hear Any Voice...But When I Turn On Loud Speker It's Ok...Also When I Connect Headset It's Also Ok....So Plz Tell Me Is It Internal/Hardwear Problem Or Anyother Problem...Plz Help Me Quiekly..Thankx In Advhanced

Test the ear piece speaker: right * left left * left star, service tests

When was your phone manufactured?
Early models (mid/late '08) had faulty earpieces so it could be one of those models.

It sounds like it's a early model, had this myself.
Sony ericssons have 2year guarantee and they will repair it free of charge

I got my C905 from Dialaphone (T-Mobile 12 month contract) in March 09 It worked perfectly for nearly 3 months. Then at the beginning of June the earpiece audio went - I couldn’t hear people but they could hear me. It was sent off for repair to Dialaphone/A-Novo repair centre in Norwich. They debranded the phone (removed T-Mobiles branding) and flashed the phone - they didn’t replace any parts. Got it back a week later and it worked perfectly - even better than before - until a few days ago when the phone began to freeze and then the colours on the screen/display became distorted. Photos would appear fuzzy and the phone would turn itself off. If I switched it back on the screen/display would remain black/blank although you could tell the phone was on as the keypad’s LEDs were lit. I tried reinstalling the software from the SE website (update service) but this didn’t help. It has now been sent back to Dialaphone/Anovo in Norwich to be repaired again. These faults appear to be quite common and to be honest put me off ever getting a Sony Ericsson again. I don't say this lightly as I've been a big fan of SE phones and haven't used another brand for the last 6 years.