Q: When speaker on iphone6 caller can't hear me any solutions

Hello Puranc,

I understand that your voice isn't being heard by callers when you put them on speaker phone. Fortunately we've an article (linked below) that details a number of troubleshooting steps which can help restore full functionality to your iPhone's microphone when using the speaker.

If your voice is too faint or sounds unclear using iPhone, or iPod touch - Apple Support

All my best