canceled - Optimus One, P500, V General

Hi Guys my device is LG KU3700
when I try to USSD (checking my balance etc.) it shows MMI code canceled
how can I solve this problem?
I did Upgrade my firmware 2.2.2 into 2.3.4 but it wasn't solve.
NEED YOUR HELP

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[Q] Who can Give me an Answer

my device is LG KU3700 (Lg optimus one p500)
when I try to USSD (checking my balance etc.) it shows MMI code canceled
how can I solve this problem?
I did Upgrade my firmware 2.2.2 into 2.3.4 but it wasn't solve.
NEED YOUR HELP...
any one..?

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You might need some details of my phone, following might be helpful to u
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