No sound through phone speaker

The iPhone, along with many other phones, has two speakers. The first is the on ear speaker and the second is the speaker at the bottom for playing music and ringtones. The speaker at the bottom could be broken so to check this, just try and use your headphones to play music. If that doesn't work either then it must be a setting on the phone so in that case just have a bit of a play with the sound settings.

that means you ear piece is dead or its disconnected,
you just need to open your phone and fix your ear peace or speaker

Many devices will automatically switch off the large speaker when ear phones are plugged into them. Also there may be a switch or button or prompt on your radio to switch between regular speaker and ear phone jack. Look for that first.
Try connecting and disconnection ear phones while listening to a station and see if the problem is intermittent. If is works sometimes but not every time then it is most likely an internal connection.
You will have to access the inside of the radio to investigate further. Connect a working external music or sound source with speaker wire to the terminals inside the radio that connect to the radio's speaker. If the radio's speaker works with the external sound source then you know it is a bad connection inside your radio. If the radio's speaker does not work with the external sound source then it is most likely a faulty radio speaker. Look closely for a broken solder point or broken/disconnected wire.

you have a bad ear speaker

Hi you should change the speaker because it is faulty thats why you can't hear any sound.

For the time being have you tried using a head set? I think this is due to the way the sound wires have been soldered together. I would not attempt to try and fix the problem yourself. If the headset doesn't work I suggest it's the way it's been programmed. Btw have you tried looking at your settings?
It might work if you put it on vibration. Does it work when it's off muted?
Hope I cleared a few things up Dr Reed

insert the ear/head phone in backpanel sound pin (Green color),

1.if You can hear the sound in ear/Head phone,then the problem is in the speaker.replace the speakers

2.if You can't hear the sound in ear/Head phone,then the problem is in your system audio driver.So Down load the audio driver which is suitable for your system and install it.

dear,
check the backside speaker of ur phone. check it if ur main ear piece is working. means that u can listen a call.
because, music in this set, relates to the back side speaker.

johanita - have the phone speaker replaced.

oleg83 - ear piece speaker needs to be replaced

heyari - replaced the speaker

GUEST - replaced the speaker on the phone

tina-ehmm-72 - the ringer and ear piece needs to be replaced

hashah - replaced the speaker

Sounds like the ear piece connection between the two halves of the phone has been broken. Your "speaker phone" function should still work because the sound comes from the back of the main body of the phone. To the best of my knowledge, this can't be fixed. You will need a new phone. I hope this helps.