Whisper mode I accidently turned my whisper mode on, and I have no idea how to turn it off. I cannot hear anyone who calls me, and they cannot hear me. How do I turn it off?

Google headset <make> <model number> driver for Motorola Whisper

Try How do adjust the settings on my WHISPER to reset your headset.

Mark
Motorola Support

Ensure that it isn't muted on headset and phone. Call us if you still have issues. Http://www.Motorola.com/contactus

Mark
Motorola Support

Check your connections. Make sure everything is plugged in properly. If it is still making a sound, even a whisper, then the amp is probably fine. Do you have other speakers connected to the amp? If so, they should be sounding too. If not, then it's definitely an amp problem. Ebay sells tons of .... well, everything, so you should check that out...

defective main board

Manual:
http://www.cellphones.ca/upload/manuals/samsung-sph-m300-manual.pdf

From Page 39 of the manual:


Selecting Options (right softkey) during a call displays a list of
features you may use during the course of a call. To select an
option, press the corresponding keypad number or highlight
the option and press . The following options are available
through the Options menu:
 (1) Key Mute/Unmute allows you to mute the microphone
on your phone so the caller is unable to hear any sound.
 (2) Turn Speaker On enables the speakerphone feature.
 (3) Set Whisper increases the microphone to its maximum
level. During a call turn on Set Whisper when speaking
softly or when the caller cannot hear your voice clearly.
This mode is useful in meetings or public places.
 (4) Call History checks your call log for Outgoing, Incoming,
Missed, and Recent calls. You can also erase the logs from
this menu.
 (5) Contacts accesses the Contacts menu.
 (6) 3-Way Call allows you to talk to two different people at
the same time. (For more information, see “Making a
Three-Way Call” on page 189.)
 (7) Messaging accesses the Messaging menu options.
 (8) Voice Memo allows you to record incoming audio from
your conversation. (For more information, see “Managing
Voice Memos” on page 135.)
 (9) Tools accesses the Tools menu options.

Manual:

The audio jack itself is faulty - I would call GPX to see if this one is still under warranty.

whisper page is usually 66. but the person your calling can hear you but the person they are on the phone with cannot.

keep ur finger on the (#) button that might work

http://www.samsung.com/us/support/download/supportDown.do?group=mobilephones&type=mobilephones&subtype=att&model_nm=SGH-A707&mType=&dType=D&vType=R
This is the full manual and addresses a few issues you mentioned.