Q: i have lost the sound on my iphone s4

Hello yousif marzoog,

Thanks for using Apple Support Communities.

If I understand your post correctly you are able to hear sound from the headset plugged in to your iPhone 4s, but not through the speakers.  If this is correct then I suggest that you follow through the steps in the link below.

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

Cheers.