Why can't I hear people when i call them on my iphone 5s?

The receiver audio is not blocked and it does work when you use a free phone calling app.
I just got a new SIM about an hour ago. And it's a Ultra.me sim. I can't hear them and they can't hear me. What should do?

My recommendation is you buy a new smartphone or you have it repaired though buying a new smartphone such as the apple iPhone 6 or the plus model is the better option as you can get a fresh battery plus the apple iPhone 5 has a glass screen when other newer smartphones have a plastic screen so in my opinion it's heaps better

Get new speakers

Go to Apple store and get replaced your speakers and also install Leo Privacy Guard. Through it you can secure all your apps on your device.

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