Q: my 4s sound doesn't right?

Basic troubleshooting steps can be found in the following article:

If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

Unfortunately, a hardware problem (such as a bad solder connection involving the audio circuits) cannot be ruled out. If the device is under warranty/guarantee, contact Apple or the reseller. Otherwise, you may want to let a service provider take a look at the phone.