Phone won't dial outbound calls. via OnePlus 5T

  1. Expat4Cebu
    Cupcake Feb 13, 2020 at 5:02 AM

    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?