just enable driving mode..
From the
Manual..
Text-to-speech output
Text-to-speech (TTS) provides audible readout of text, for
example, the contents of text messages, and the Caller ID for
incoming calls.
1. From the Home screen, touch Menu, then select
Settings ➔ Language and input ➔ Text-to-speech output.
2. Touch a setting to configure:
• Preferred TTS engine
– Select Google Text-to-speech Engine, or Samsung TTS.
• General
– Speech rate: Choose a rate at which text readouts are spoken.
– Listen to an example: Play a sample of speech synthesis.
– Driving mode: When enabled, incoming calls and new
notifications are read out automatically. Touch to
enable. Touch Driving mode to choose items for readout when
Driving mode is enabled.