Problem call

[e30luismi]

Hello, when he called didn't hear anything if i only heard the speaker.

[Hampus]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

Do you mean that you cannot hear the counterpart while using the ear speaker? If you go to Settings > About phone > Diagnostics > Test device > Ear speaker, does it work here? If not, I suggest that you perform a software repair via PC Companion:

http://www.sonymobile.com/global-en/tools/pc-companion/

In PC Companion you press start on Support Zone > Start on Update the phone/tablet software > Repair phone/tablet (the blue clickable link in the message) > Follow these steps without having your device connected to the PC.

Follow the instruction that appears in the program and do not connect your device until this guide tells you how to connect it.

[e30luismi]

problem hardware?

[Hampus]

If you have tried above suggestion but there are no improvement, there might be a hardware problem. I suggest that you visit nearest service center to have your phone examined by a technician. You can contact your local support team for further information about how to proceed with this in the best possible way:
http://www.sonymobile.com/global-en/support/contact-us/contact-info/