Q: speaker phone iPhone 6 stopped working on ios9.2

Hello mw5375, 

Thank you for using Apple Support Communities. 

I see you are having issues with the speaker phone on your iPhone 6. Since you have not specified exactly what is or is not happening when you try to use the speakerphone on your iPhone, I have provided a few articles relating to the speaker or microphone not working.

If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker

Get help with the microphones on your iPhone, iPad, and iPod touch

If you can‘t hear a person on a call or voicemail or if the sound isn‘t clear on your iPhone

If these don't help or there is something different going on, please get back with us with more specific information and we can go from there. 

Happy Holidays.