iOS 7 has new Privacy Settings, including restrictions on the microphone. When you use the microphone in an app for the first time, the app will ask you for permission to access the microphone. For example you may get a prompt such as:
“SpeakColors Español Pro” Would Like to Access the Microphone.
You are given two choices:
1. Don’t Allow
If you selected Don’t Allow, the microphone won’t work and you will need to change the settings.
Please follow these steps to enable the microphone:
1. Press Settings
2. Press Privacy
3. Press Microphone
4. Enable microphone access for for the app: