@Rockstar11:
In Dual standby u will be connected to both networks while you are in a call.
Bt in dual active, if u are in a call in 1 and if u try to call in d other, it will say unreachable.
In both Dual sim activ and dual stand by u can sen or receive msgs at the same time.
Most of the samsung dual sims are dual stand by,Nokia C2-00
All of micromax are dual active
In SIM shift it has 2 sim slots bt only one will b active at any time.
Nokia C1-00
In C1-00 if u press and hold '*', u can shift b/w the two.
I hope this is correct..