Really appreciate everyone's reply, I just got this phone recently and not planning to change it anytime soon, if rooting is an option to enable a reliable Phone Calls, then I would like to learn what Rooting is, and what are the issues that I must be aware when rooting a phone. Hopefully someone will an experience in rooting is able to guide me, that would be helpful. As I just found out that "OK Google" Does not work in XZ3 either, really disappointing for a flagship phone to have soo many issues.