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I am using a Samsung Galaxy Core Duos (GT-i8262). When I bought it, I was able to use both SIM cards. But after some time I was having problem that only SIM 1 works, other SIM always says "no network card". First the OS was Android 4.1 but now I ave rooted it to SaMyKat V3, Android 4.4.2 – and 2nd SIM is not working.

Both Sims are Inserted.
Both SIMs are Inserted. (click image for larger variant)

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    Might be a problem with custom ROM. Have you read the known issues of SamyKat? – MANI Oct 20 '14 at 16:45

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