Volume Speakerphone works but when the speakerphone is not on and using regular speaker, there is no volume.

Possible. Check out your manual regarding speaker phone settings, etc.

1. • 1 Press the green "Phone" key on the main screen of your iPhone. This key has a silhouette of a traditional hand receiver and is located on the bottom part of the screen.
     
   • 2 Begin to use your speakerphone by making a call or accepting a call from other participants. You can make a call by going to your "Contacts" list or activating the keyboard and dialing a number. Incoming phone calls can be accepted by pressing the "Accept" key underneath the caller ID.
     
   • 3 Activate the "Speaker" function on your iPhone when you are ready to use your speakerphone. This button is located above the caller's information and allows you to switch on and off with one tap of your finger.
     
   • 4 Put participants on hold while you use your iPhone speakerphone. There is a "Hold" key at the bottom of the calling screen that lets you speak to people without bringing callers into the conversation.
     
   • 5 Access your contact information over the Internet while you use your speakerphone. You can reach the main page of your iPhone by pressing the "Home" button if you are on hold. The iPhone does not allow you to play music or use other audio options while on hold because you are still on the phone.
     
   • 6 Adjust the volume level before you begin a conference using your speakerphone. There are volume buttons on the side of the iPhone that provide detailed control over speaker sound levels.
     
   • 7 Mute the speakerphone if you must leave your office or take a break from a conversation. The "Mute" key is available on the call screen and instantly cuts off your microphone and the speaker.
     
   • 8 Add new contacts to your iPhone that you have called on your speakerphone. You can go back to your "Recent Calls" list or the keyboard to find numbers to add to your "Contacts" list.
     

Read more: How to Use the iPhone Speakerphone ' eHow.com http://www.ehow.com/how_2080582_use-iphone-speakerphone.html#ixzz1LKkzVgm3

Whilst on a call in bluetooth mode change the volume. It needs to be for each different "speaker" you use

http://www.fixya.com/support/r3771170-phone_water_damage

This speakerphone is a separate speaker from the handset speaker, so if you can't hear through the handset and you have ensured that the volume in your profile is set up to max, then I would have to say there is something wrong with the handset speaker.

Hope this helps,
Bill

check if there is any dust in the speaker
contact service center

Try these couple of things:
The speakerphone feature lets you hear audio through the speaker and
talk without holding the phone.

1. To activate the speakerphone while in answering or calling modes,
   press the Navigation Key to the right.
2. The phone returns to normal (Speakerphone Off) after ending a call
   or when the phone is turned off and back on.

To adjust the ringer, key tone, voice call and speaker phone volume levels:
1. Press left soft key [MENU] (7) (1) (2).
2. Select the type of volume you wish to adjust.
3. Select the desired volume level.
4. To confirm, press OK.

Let me know if this works for you or if I can help you with anything else.
JimmyC

the speaker needs to be replaced it is busted so take the phone to a mobile service center and have them fix it.

Here is how you activate the speaker phone:

1. During a call, press the Options soft key to access the following: Loud Spkr ON/OFF: Allows you to enable the speakerphone option.
2. Also, During a call, use the speakerphone key in conjunction with the left soft key to activate the speakerphone operation.

For both options use the volume keys (located on the left side
of your phone) to adjust the volume.

If neither of these methods work, then there is a problem with your phone.

Good Luck!

Saw this once with a bad speaker and another time the reset process shut something off....

It's been about 6 years... sorry...

AL