Problem with heaing incoming and outgoing calls unless using speakerphone

You have probably accidentally activated a blocking function on your phone! Take the portable handset, and remove the battery. Wait five minutes, then reconnect the battery. That should reset the phone to "initial conditions," which are the settings it had when it was new.

Sounds like you reciever speaker is out. It might be cheaper to get a new phone than fix this one. Check with out a local cell repair store to see what they charge then make an informed decision.

maybe your handset volume is turned down.

Then visit the nearest service station with the your HH.

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:

voice not hearable on incoming calls and outgoing calls

dakarjohn - you need to replaced the speaker on the phone.

GUEST - replace the speaker on the phone.


SAEFUJI - you need to replaced the flexcable on the phones, contact your mobile provider or your local operator for assistance.

okkk master reset ur phone if it dont works flesh a newer software

cannot hear incoming calls or outgoing calls