If the Mobile Says Invalid Sim means you assume it locked to some Network...You need to Unlock it...You can get the Unlock code here
http://www.mobileunlocksolutions.com/lg-ku990-viewty/rs1wp9/ and Unlock it...
It's means your phone still locked and you must have lg ku990 viewty unlock code to unlock your phone network. This code can you get from your network provider or purchase from online lg unlock code retailer.
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