Samsung Galaxy Grand Duos - Has anyone got full dual sim functionality with custom ROM?

sling-shot

Wise Old Owl
I have been eyeing the Galaxy Grand Duos for sometime now. I have read somewhere that custom ROMs are not fully functional in the sense that the 'dual' SIM functionality does not work.
Is it true?
I have read a few guides on rooting this model. So rooting as such seems to work. I may be content with rooting alone. But then again might be tempted to try a newer Android version not provided by Samsung. (Vanilla if possible)
 
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