How does oppo r9 set up HD voice calls?

How to open VoLTE with R9 mobile phone;

1, contact the operator to open the VoLTE function for the mobile phone card;

2. Enter the phone settings -Phone- and turn on the VoLTE voice calling function.

"Perfect beauty" is the essence of OPPO brand, which conveys OPPO brand's pursuit of perfection and its determination to achieve perfection. The ultimate beauty not only represents the pursuit of the ultimate, but also represents the pursuit of beauty and art.

Chen Mingyong, CEO of OPPO, explained "the ultimate beauty" as follows: "All products produced by OPPO must be exquisite designs and works of art with style". OPPO's brand mission is to create a beautiful life experience through exquisite products and innovative technologies.