Iphone 7 Plus only place calls via bluetooth

I have an iPhone 7 Plus 128GB and it’s only a little over a year old. A couple weeks ago it stopped letting me take phone calls. First they got real glitchy and did weird stuff like repeat the last word I said 100x or speed up whatever the person said on the other end and made them sound like a chipmunk. Oddly on my end it was slowing my speech and making me sound robotic. Anyway eventually it stopped letting me make and answer calls altogether. Now the only way I can answer a call is when I’m in the car through Bluetooth or he4adphones.