How do I turn up the volume of the phone?
The sound of the internal speaker is very weak, sometimes I can not hear the phone call, what is the reason?
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most of the time its due to dirt build up in the speaker grills
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Oke and how do I clean this? Do I have to open the back of the mobile phone?
@rudolphste89022 A toothbrush, 90% or higher concentration isopropyl alcohol, some compressed air are recommended. Wet the toothbrush and gently scrub out the speaker grille opening, then blow it clean with a can of compressed air. If you see some improvement but feel there's room for more, then repeat as needed.
If there's still no joy, you may consider replacing the speaker. Here's how:
