Expat4Cebu , via OnePlus 5T , Feb 13, 2020 at 5:02 AM : My 5t suddenly refuses to make voice calls. It will send and receive text and it will receive voice calls but won't make phone calls. I tap the green call button and within 3 seconds or so, it simply returns to dialing screen without making the call. I've checked relevant settings but nothing is amiss. How do i fix this?