Q: iPhone 6plus volume issue

Hi, Mgaldy.  

Thank you for visiting Apple Support Communities. 

I understand the volume is not working as expected on your iPhone 6 Plus.  I would need more information on which type of volume is low to provide a better answer.  However, here are some troubleshooting steps that may help with this scenario.  

Acoustic-speaker/microphone/receiver

Get help with these issues:

• No sound or distorted sound from speaker
• Microphone issues
• Receiver issues
• No sound through stereo headset

Get help with hardware features on your iPhone, iPad, and iPod touch

Regards