My nokia N72 wont turn on.

Have you tried restarting it?

unexpected error is occured when i was open camera ..

goto menu --> settings-->display--->font size --->set font size to normal or small.that will do... plz rate me !! if it helps ,if not feel free to comment

You will need to format your phone and restore it to factory settings. Backup your data before you start the format. To format:
Press *#7780# on your phone, it shall ask you weather you want to restore the phone to factory defaults? Select Yes, enter the security code (default is 12345) the phone shall restart. Now once it comes back, press *#7370# and follow the same process again. After it comes back, everything should be working fine.

In case you do not remember the security code, then turn off the phone, press the star key (*), number 3 key and Green keys (the one used to make the calls) together and keeping them pressed turn on the phone, do not release the keys until you see the formatting screen, let it complete and the phone shall restart and then it should be working fine.

Go menu>Imaging>Camra

Hi..

The problem of your phoen is the key mathyou need to replace the kay math of your phone,,

Regards
PCmania

nokia n72 has a slow operating system which gets even slower if the battery is low and thw problems are doubled if the memory is near full. Sometimes unsupported applications hang on it which can only be stopped by removing the battery and restarting the phone.Restarting may take a lot of time but have patience and once the phone restarts delete the application which caused the hanging. An advice is to keep the memory card half empty.

try these:

You need 1 mobile phones and a memory card reader.

1) Do _not_ turn off the mobile phone!
2) Remove the Memory Card (MMC) from the locked phone and put it into a
memory card reader. Create
the directory E:\System\Recogs and copy thc-nokia-unlock.mdl into
this directory.
3) Remove the Memory Card and place it into the locked phone.
The THC-NOKIA-UNLOCK program should start after 120 seconds.
4) Remove the battery. Remove the MMC. Put the battery back and restart.
The Phone Lock has been reset to "12345".

my nokia n72 camera is not working, when i open the slide it says unexpected error occured. power off the device and restart.

first thing you is move all the contents using phone memory to memory card (Regards Paljor Lama)