Loose speaker wire attached to screen

Make sure all the volume is up. If you sill don't hear anything, speaker or wires might be faulty. Needs servicing.

Hi i've inserted a link to the manual below:
Turning the speaker phone on or off during a call On the screen, to toggle between turning the speakerphone on or off. The speaker phone icon appears in the status bar when the speakerphone is on. To avoid damage to your hearing, do not hold your phone against your ear when the speakerphone is turned on PAGE 48
MANUAL: http://member.america.htc.com/download/Web_materials/Manual/HTC_Aria_ATT/100810_Aria_AT&T_English_UM.pdf

your cell phone probably has an internal speaker for you to hold the phone up to your ear and talk and an external speaker that is used for the ringtone and for you to use the talk on speakerphone option. You can try to use the speakerphone to speakerphone and see if you can hear your callers.
If you phone's internal speaker is not working, the phone needs to be repaired or replaced.

Just flip the headphone pad inside out on the Optimus Pro 100 wireless headphones.
Find the 3 screws on each headphone speaker, you have to push the existing cover back, but you'll find them. Remove the 3 screws. Be careful of the speaker wire that will be attached to the cover plate that has the ear pad on it. Also, look carefully at how the components are assembled inside the headphone, as you might disturb their setting. They are easy to return to their proper place if they move.
Gently remove the ear pad, turn it inside out and you will have a new covered ear pad. GENTLY, re-install ear pad onto speaker plate, be careful not to break the speaker wire that is attached. I found a little flat screwdriver helps to pull the edge of the pad over the plate. The ear pad is actually quite strong and can take some abuse, but don't pull the speaker wires loose.
After you have the cover back on, find the screw holes and put the 3 screws back in. Presto, a little cleanup on any loose pieces of covering from the original side and your done for another couple years or so.

1. Take the battery out to reset/reboot.
2. Once it powers up, plug a wired headset into it.
If you can hear through the headset fine -but not thru the ear speaker, well then its the ear speaker that has gone bad. (Hardware problem.. if its less than a year old or u have cell phone insurance, call your cell company and see if they will replace that under warranty)
You could also try speakerphone and see if that works.. if the ear speaker goes out - maybe the loud speaker will still work.

The other post refers to the process that allows you to use speaker only, instead of automatically selecting earpiece. Unfortunately, this will not resolve your issue, as it appears that your earpiece has a loose connection and must be repaired, or you can continue to use speakerphone, bluetooth (if capable), or wired headset.

Hi!... You need to replace the ear speaker of your phone and it will be okay.

go to the service center and change the audio software alone...

Seriously, sometimes if you have the other person yell, it will just magically "pop" back in. THis only lasts a few minutes though. Unless you can deal with speaker phone, I suggest a new phone.

I just fixed mine. No ring or external sounds following a short drop. Found a loose internal header on the back, right side of the phone.

Remove back.
Remove battery.
Remove SIM.
Remove 4 screws (note will void warranty)
Starting from top, carefully de-attach rear plastic cover.
Inspect. Header on right side as you look at the back of the phone has black/white wire going to speaker.
Reattach.
Re-install in reverse order.

Crazy phone still works great!

R