The people I call can't hear me on my LG Env VX 9900

With the phone OFF and BATTERY OUT.
BACK COVER OFF.
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Pass a vacuum cleaner gently over the MIC for two minutes.
A small paper clip can be use to assist removal of dust and dirt.
DO NOT PUSH paper clip or any object inside.
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Inspect for dis-mounted item inside the phone.
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Re-insert battery and cover.
LG Env VX 9900 is the best music and simple video phone.
Do this clean up around the lower MIC portion will keep the sound quality is check.