iPhone 5 returns 3 input channels about novocaine HOT 3 OPEN

// Check the number of input channels.
// Find the number of channels
UInt32 size = sizeof(self.numInputChannels);
UInt32 newNumChannels;
CheckError(AudioSessionGetProperty(kAudioSessionProperty_CurrentHardwareInputNumberChannels,
                                      &size,
                                      &newNumChannels), "Checking number of input channels");
self.numInputChannels = newNumChannels;
DLog(@"Audio input channels: %lu", self.numInputChannels);
if(self.numInputChannels >= 3){
    self.numInputChannels = 1;
}