telephony problem

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hi there.

i just got an LG optimus 7 and all seemed fine untill i needed to make a phone call. I couldn't hear anything and the guy I wanted to talk to didnt hear me either. But as soon as i turned on the speaker mode during call, all went fine, i could hear and i was heard. Disabling speaker mode gave me the same result : no hear no heard.... Any ideas ? I made a factory reset ( vol + vol - camera buttnon then press power) and still the same problem...
Phone was bought from abroad and warranty is pretty useless here...
thanks

LE : flashed the open european fw, the orange uk fw .. same results... I'm thining this is a sowftware ( settings ) problem, since both speaker and microphone are working ( theres one speaker and one mic as we all know) , and maybe some MFG setting would bring some joy.. but i dont find any user service manual around...

Try MFG sofftware (you should find how to install it in other posts). In MFG you should find menu with test many device components exmpl: camera, gps and others and speaker or mic. If it dosn't help I think you have a damage phone and you should contact with service support.