loudspeaker

Can I use the loudspeaker feature during a call on my phone? Because what I found uses audio calls with very low volume, is there any tutorial or example code to add a loudspeaker to Phonemin?

How about for iOS? I'm having trouble with acoustic feedback on iOS. How can I implement echo cancellation or how to reduce acoustic feedback?

Hi I am facing an issue with android device.. When the call is in loudspeaker there is a lot of feedback when two people are talking to each other is there any way to eliminate the feedback?