Can only use speaker phone
To talk on the phone I can only use speaker phone, or no one can hear me.
The Nokia Lumia 900 is a Windows Phone 7.5-powered smartphone with 4G LTE support and a ClearBlack AMOLED capacitive touchscreen.
the lower mic is either plugged or broken.
Start by taking a pin, and shimming it around inside the mic hole. (dont push too far up as to cause damage to the mic.) i personally use a sim extractor, push it in, and twist.
If this doesnt fix the issue, you would need to replace the lower mic
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