If it ask for a PIN code then it means it's asking for the password/code you have entered on your SIM card. If it asks for Security code then that means it's the password/code for the phone.
Entering three invalid PIN codes on your phone then your PIN may be locked and you can only unlcok it by entering the PUK code on your SIM. PUK code is available on the sim card pack. Once it's ented, you have the option of changing your PIN code. Just be sure to remember your PIN code so the same incident won't happen again. If it ask for security code, enter the code you have for the phone but if you don't remember setting a security code, then you may try the default security code of Sony Ericsson phones which is 00000.
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To Unlock the Sony Ericsson K550i Mobile from the Network Lock You can use the Unlock Code,You can get the Unlock Code at http://www.wickedunlock.com/sony-ericsson-k550i/rs11wp9/ and Unlock from the Security lock use the Master Reset Code.
a programme called setool lite could reset the code back to 0000
download setool lite here: http://www.4shared.com/file/VSqGxHQu/SE_Tool_2_Lite_111.html?s=1
turn antivirus resident sheild off (it will report this programme as a false positive) when downloaded extract file with winrar
turn phone off and remove sim and memory card do not turn phone back on! select k550 in the list press 'identify' on setool lite press and hold 'c' on the phone and plug usb cable in
it will ask for driver which is in the setool lite folder so direct it to there
after driver installed setool will then read your phone and displa info on the screen
as soon as that has finished unplug your phone, put sim and memory card back on and the security code should be reset to 0000
You can get the unlock code for your Sony Ericsson K550i from www.Theunlockarena.com . This site provides excellent service in unlocking solutions. The unlocking codes provided here are 100% accurate and very affordable. The unlocking process is very simple here. Here are the steps for unlocking Sony Ericsson K550i,1 - Switch ON your Sony Ericsson K550i without any SIM Card, 2 - Press the left arrow key/button once, 3 - Press the button * twice, 4 - Press the left arrow key/button once, 5 - The message "Personalize with MNC2" will appear, (or you will have displayed an unlock menu, select the lock you want to unlock) 6 - Enter the Unlock Code.
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