Hi Li,

It sounds like you've got a hung process somewhere in the device. I can't tell from your description exactly what's wrong, but here are some generic troubleshooting techniques applicable to S60 phones:

1) When you say "restart" your phone, I assume you mean you've turned the power switch off and then back on. Have you tried turning off the device, removing the battery for about a minute, then restarting the phone? That technique should kill and processes and give you a clean restart.

2) The phone may be waiting for an unlock code from you. The default unlock code for the N90 is 12345. Try entering that key sequence and see if it unlocks.

3) You might have an unresponsive Symbian app, but technique (1) should have cleared it. For general information, though, you can shut down an unresponsive Symbian app by opening the application switching window by pressing the menu key. Then scroll to the application, and press the erase key (the one that looks like a squared-off C) to
close the application.

If none of those techniques work, it's time to call support. Here's the contact info: http://www.nokia.com/support

Hi, Kevin,

thanks for your replay, I have solved this problem, my SIM Card is error. when I insert my SIM Card into other phones, the phone's screen shows "Sim Card refuse service", so I changed another Card in my phone, that is ok.

thank you !

my nokia n90 after i updated its firmware version with the latest one from nokia site , it restarts by itself everynow and then

I fix it after the update.
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