Question about Nokia N91 Cellular Phone

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Sim problem Phone accepts sim pin then quickly displays sim invalid

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It can be due to one of the following reasons.
1.Dust accumulated on SIM: Clean the sim and after inserting press it firmly.
2.Software problem: restart the phone and try again. If problem persists contact the nearby service center for software upgradation.
3.SIM card is not registered because of not using for a long time. Contact your service provider to check for the status of your number.

Posted on Sep 25, 2008

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1 - Insert non-Cingular SIM card" 2 - Power on the handset - Phone will display "Invalid SmartChip" (IF THE PHONE DOES NOT DISPLAY INVALID SMARTCHIP, PLEASE POWER OFF AND ON AGAIN) 3 - In Idle screen, enter 159753#*#. Phone will display "Enter NCK, Remaining 5 4 - Enter the 8 digit SIM Unlock code 5 - Select "OK" 6 - The handset is now successfully unlocked
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1-Insert non-Cingular SIM card" 2-Power on the handset - Phone will display "Invalid SmartChip". 3-Enter *#865625# then select option 1 and then again select 1 4-Enter the 16 digit SIM Unlock code 5-Device should say: Network Lock Deactivated 6-The handset is unlocked. 7-How to Enter Unlock Codes on CU575 (Trax) How to Enter Unlock Codes on LG F2250:
1-With allowed sim card in the start menu type: 2945#*3311#. 2-Handset shows saved, then return to startup screen 3-Press Menu key, choose Settings > Security > Sim Lock> Network > Deactivate, handset will now show 'Enter NCK' 4-Enter your unlock code and OK. How to Enter Unlock Codes on LG U8110:
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If If instruction above does not help you i would strogly suggest to contact your Service Provider to provide some alternatives.


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Jun 03, 2011 | LG Cell Phones

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