I can answer about the SIM card...
Veriozn is a CDMA carrier (mostly used in the USA) but the device that you are using is a CDMA / GSM device and can be used also with GSM carrier (such as T-Mobile and At&t).
The GSM Network is mostly used all over the world and most of the carriers overseas are GSM carriers that using SIM cards with the phones they are selling.
The Verizon SIM Card in your Blackberry is there for the option if you go out of the country (lets say for example on a vacation in Europe) so they can make it work with the GSM network frequencies used in Europe (and charge you for "overseas" pricing).
You can benefit from it by unlocking your device. When the carriers sell cellphones they give it with a security SIM Lock that is set into the device to keep the device in their coverage,
unlocking Blackberry 9930 will turn the device into a SIM free device that can work with other carriers.
That means that after the device has been unlocked you can insert a SIM Card of any GSM carrier into your Blackberry's SIM slot and it will get signal and will work with the phone number of the SIM card.
The main benefits are that when it's unlocked you can stay with your device and switch carriers.. or use it with other carriers while you are visiting other countries (prepaid sim will work and you don't need to rent a cell phone to use local on vacations and such) and also if you want to sell it, if it's unlocked BlackBerry device it will be much easier to find a seller (you have a much bigger range of users that will want it) and for that - you can set a normal price instead of low one and still get it sold fast.
hope that this info will answer your question... about your first one - sorry.. but i don't know... maybe you should contact your carrier for that and ask them.