Why is my iphone phone call fuzzy?

So every time I call my friend, the phone line is clear and then 2 min later it's fuzzy and we have a hard time hearing each other! Why does this happen? I have an iPhone 5s and she has a iPhone 6! We both use headphones when talking and the line always so super fuzzy and I hate it. It doesn't happen to other people when I call them.

Go nearly care shop & repair as well

  • Why is my iphone 6 camera fuzzy? It was all clear a little while ago, then I went outside and was using it (it was sunny and 80 degrees) and now I'm back inside and it's all fuzzy and foggyish. What happened? Can i fix it?
  • What are my options cause my iphone (4) main camera has gone fuzzy? The main camera on my iPhone has gone fuzzy. The white colors kind of glow and everything is just fuzzy and it is really bugging me because i love taking pictures!
  • My iPhone 4s Speaker Sounds Fuzzy? I've only had the phone since late March, and it was bought directly from the store, brand new. At first the speakers were fine, but in the past few weeks whether it's talking on the phone or playing music, the sound has static/a fuzziness to it. I've been incredibly careful with the phone, haven't dropped it and made sure to buy a heavy duty case. What's wrong?
  • IPHONE FELL IN TOILET CAMERA IS FUZZY Okay, so i dropped my iphone in the toilet by accident, and everything still worked. The only thing that didn't work was the sound, which i later solved by blowing into the speakers. But the camera is really foggy/blurry and i see bubbles in the camera lenses. It's in rice, I turned it off, BUT EVERYTIME I PUT THE PHONE INTO THE BAG OF RICE IT REBOOTS! How do i stop making it reboot and actually just have it off T_T