音質が悪すぎ(hardly talk)

試しに妹の携帯にかけてみたのですが、全くお互い何を言っているかわからなくて切るしかありませんでした…
I called for my sisters cell for experiment,but we couldnt understand what each other says..I had no way other than hung up.

angelorphankaori about WeTalk- WiFi Calls & 2nd Phone, v8.6.3.3