Re: Dual sim
Mine changes the sim depending on where I am. It appears to pick up the network for each of the sims and switches as necessary. If there is a conflict it gives me a choice of which one to use.
There is also a very good sim management application that even goes as far as locking to one sim if necessary.
Unfortunately, I have vet to find many details about dual sim phones and their use. I think this may be down to the fact that most phones are supplied by an operator that has a vested interest you using their network only.