[Q] I do not hear calls. help

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I have a problem with my phone one day to another calls are heard almost nothing too low can not find the problem and return to the original rom and nothing stays the same even prodian please help thanks..

Have you tried re-flashing your chosen rom?
Flashtool guide here...
http://forum.xda-developers.com/showthread.php?t=928343

Or...

If you want to return to your original rom but you cant, then maybe think about starting all over again from stock rom. Then you can flash to whatever you like from a nice clean install

You can do this using several methods...
PC companion...
http://www.sonymobile.com/gb/tools/pc-companion/

Sony Ericsson Update Service (SEUS)...
http://sony-ericsson-update-service.en.uptodown.com/

Wotanserver...(free but gotta sign up)
http://www.wotanserver.com/en/

Hope this helps