I have n73 cell it gets hanged very often indicating that memory card is not inserted. it also shows 'closing application' and images from picture gallery get deleted which come back after few days. in addition, same is the case with music. During a call, the another person is not able to hear the voice.

Long press navigation or menu button,if there are existing application running or unwanted application,navigate that apps and just press c to exit or close that application.this may happen when you open an apps and do not close the apps properly then open a new one,this error takes place. If does not work,you need to format the phone to remove the unwanted running application on your system,just type *#7370# on your home screen,a lock code will be ask then enter your preferred code if change before, or 12345 as the default code,be sure to back up all of your data before doing this method.

The memory card slot for Nokia N73 is located at the bottom of the keypad just above the charger connector.

1. Before you eject the card, press the power key, and select Remove mem. card. All applications are closed.
2. When Remove memory card and press 'OK' is displayed, open the door of the memory card slot.
3. Press the memory card to release it from the slot.

Do not remove the memory card in the middle of an operation when the card is being accessed. Removing the card in the middle of an operation may damage the memory card as well as the device, and data stored on the card may be corrupted.

Hi there format the memory card and then insert. Some how few data is corrupt and that why mobile hang after insert the card.

try this:
1. try inserting the memory card to other mobile phone. 2. if it hangs, then your memory card is defective or it has a virus.

HI there format the memory card from the computer & after that insert it in mobile. If your memory card infected by virus then then phone will hang. So before insert format the card from a virusless PC. Thanks.

ur memory card may damaged or used password in memory card. pls check other phone to confrm

first try to format the memory card through the mobile ...

kindly update your nokia phone through nokia software updater ..
http://www.nokia.co.in/get-support-and-software/download-software/device-software-update/download

Solution:

1.Move your images & Videos from Phone Memory to Memory Card..

2.Install Applications in Memory Card Only..

3.if this issue still persists use this reset code

*#7370#

Try removing your memory card and then using the phone.
If this solves the problem, then might be your phone is unable to deal with the amount of data stored on your memory card.


OR

Remove applications like 'FS caller' and applications that eat resources of your phone.