Here are a couple of phones with best speaker quality for conference calls.  

1.  The HTC One

This phone will amaze people used to tinny smartphone speakers.  The speakers on this phone are designed to send audio at the right direction.  The phone is equipped with Beats Audio. htc one best speaker phone  

2.  Pantech Discover

  • The 4G LTE Pantech Discover has an excellent ergonomic design, great external speakers, a good camera, and comes at an incredible value.
  • best speaker smartphone for conference calls.