Z30 prone to dust/dirt collecting in microphone area

Just back from Verizon wireless after complaining about low sound from microphone (speaker phone worked fine for my voice to be heard). Technician said small open area above microphone and many cases with equally small opening contributes to dirt-dust settling in and under case or under front of phone and can't be seen. Remedy is to remove third party after market case and rear battery case cover and use compressed air to clean the microphone area. My problem of "faint" voice sound was fixed asap. Verizon rep said they had seen and fixed baby Z30 with similar symptoms.

Posted via CB10

Thank you for this helpful tip! I am going to check mine out as well.