IPhone hearing problem after updating software? - 1

? I updated to iOS 6.1.3 on iPhone 3GS and since then I can't hear while making calls with the iPhone please what can I do?

Just use good common sense:

The last time I looked, your iPhone is PORTABLE.

So, take it back to the Store where you bought the iPhone, and they will fix it for free. IOS Upgrade fixes are always free, unless you did something that caused the iOS 6.1.3 Upgrade to fail (like JailBreaking your iPhone).