My P990i Jog Dial is not working properly. it is jumping up or down without any control. Please help me to fix it.

phone off and out the SIM card : jog dial up * jog dial down jog dial down * jog dial * and open the service menu select 3.rd thing and start reset ... ok my friend.

You can do this by entering the Service Menu and selecting Format. Here is how to get there:

1. In flip closed mode: jog-dial up, *, down, down, *, down, * -
2. In flip open/removed mode: In phone application, jog-dial up, touch *, down, down, *, down, * .

You can do this by entering the Service Menu and selecting Format. Here is how to get there:

1. In flip closed mode: jog-dial up, *, down, down, *, down, * -
2. In flip open/removed mode: In phone application, jog-dial up, touch *, down, down, *, down, * .

You will have to format your phone. Here is how to do it.
Enter the Service Menu and select Format. Here is how to get there:

1. In flip closed mode: jog-dial up, *, down, down, *, down, * -
2. In flip open/removed mode: In phone application, jog-dial up, touch *, down, down, *, down, *

my question is i am flash our Sony Ericsson P990i but my my cell phone lot of time restart again and again what i can do

You can either take your phone to the service center or fix it yourself at home. To do it yourself, you can do this by entering the Service Menu and selecting Format. Here is how to get there:

1. In flip closed mode: jog-dial up, *, down, down, *, down, * -
2. In flip open/removed mode: In phone application, jog-dial up, touch *, down, down, *, down, *

Hi
 it's  better formatting the internal disk instead of the master reset. The way to do that is entering the Service Menu (Jog Dial Up/ Press * / Jog Dial Down / Jog Dial Down / Press * /Jog Dial Down/ Press *) and choose "Format Internal Disk".

REMEMBER THAT ALL YOUR INSTALLED APPZ AND SETTINGS WILL BE LOST (the phone turns in factory defaults settings)

to format a p990 you can do it from the service menu to do it you you have to close the flip and do this (jog dial up,*,jog dial down,jog dial down, *jog dial down, *) and choose format memory

you can do it from your phone itself..

• Jog dial up
• Press * key
• Jog dial down
• Jog dial down again
• Press * key
• Jog dial down
• Press * key

You will get 3 options

1. Information
2. Service tests
3. Service functions

If you select 'service functions' it will ask you
"Are you sure you want to format your internal disk?" Yes or No.

Formatting will delete all the contents of your phone, so you might want to back it up first.

I encountered the same problem but was able to fix it. Just don't know if it's just temporary. Go to tools, control panel, other, set up wizard, tap yes, tap the second button before cancel, keep on clicking to the right direction until the numbers 1, 2, 3 and 4 appears. Tap the center of each number until blinking stops, save settings. For the first few steps you may use the jog dial found on the left side of the phone if the touch screen does not follow your tappings.