Data Scientist for Republic Wireless here. We operate a hybrid mobile phone service that leverages both VoIP and traditional circuit switched networks to let ou

Data Scientist for Republic Wireless here. We operate a hybrid mobile phone service that leverages both VoIP and traditional circuit switched networks to let our customers make calls. When asked to rate the quality of a call, our users consistently rate pure VoIP calls higher than their pure circuit switched counterparts. A significant portion of that is due to our "bonded calling" technology - if a VoIP call over Wifi starts to degrade, we can supplement the audio stream with additional packets sent over LTE until Wifi issues calm down. When we first rolled that tech out, we saw a marked improvement in call quality measures, and a noticeable drop in customer support complaints about call quality. In the end, I can't say this issue will ever be solved to OP's satisfaction, but we're making some incredible strides.