I bought the mobile in London and it was working fine there. When I returned to India, and entered a local sim and switched the mobile on I saw the INVALID SIm error, although the sim works fine with any other mobile.
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Hi, a definate solution exists for the cheap chinese dual sim phones when they show invalid sim. Go to ebay and search for invalid sim.
This solution might work for other phones too, but you will have to contact the person to see if he knows about your specific phone.
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