Hey, I don`t know about the VS, but if we have a sim then we will have one operator where we are paying to but if they can`t get us a good connectoin then it is posseble to take a order operator but you still pay to your normal operator. But you use a order network.
You can store numbers on a sim but you can store them on your GSM to. So if you have a GSM with much flash in it then you can store much numbers if you like.
But I don`t know if you realy need to hold 700 numbers in one GSM then I think its better to use advanced GSM/organicer.
Thanks,