Put it to service, or if you have some disassembly skills, you can disassemble your phone using this manual: http://soubor.iprotebe.cz/files/sony_ericsson/documents/W810_WORKING%20INSTRUCTION%20Revize_A%20%20(06-03-29).rar than try to clean mic's contacts, or buy new mic on ebay and replace it
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Put it to service, or if you have some disassembly skills, you can disassemble your phone using this manual: http://soubor.iprotebe.cz/files/sony_ericsson/documents/W810_WORKING%20INSTRUCTION%20Revize_A%20%20(06-03-29).rar than try to clean mic's contacts, or buy new mic on ebay and replace it