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I am carrying a Nokia E75 mobile phone which i bought last week. It was working fine yet but today when i turned it on it is asking me for Security code itself. I don't know why. I din't made any changes or anything. Also, when i am putting '0000' as the code it is not accepting? Please help
First of all i don't know why the mobile has started asking for the security code but it keeps asking for the same because the code you are entering is wrong. The default security code for most of Nokia mobiles is 12345.
Please note that the security code, which protects the phone itself, differs from the PIN code, which protects the SIM card. And 0000 is i think the code of your sim card.
Your phone is equipped with one or more codes to protect it against unauthorized use. If your phone is prompting you for a security code and you have not activated one, please enter 12345. Some operators configure phones so that they only work with their brands' SIM cards. In this case, if you enter the wrong code three or more consecutive times, the phone may lock permanently. If this happens, contact your operator or service provider for assistance.
In many cases when you enter the wrong code three or more consecutive times, the phone switches to a "sleep mode" and does not accept any entries for the next 15 minutes. In this case, power the phone off, then back on, let it sit idle or untouched for 15 minutes, then try again or bring it to a Nokia Care point. If your phone still requests a security code, please bring it to the nearest Nokia service center for inspection.