Will try to help.....
1. MVNO's which use CDMA formats like Page Plus use the VZ network so therefore they must be compatible with whatever restrictions VZ puts on them. As I said above.....currently the only way around this is to have the phone flashed.
2. The sim card on VZ CDMA phones currently are only used for LTE service. The actual activation is done without using the sim card UNLESS you are using LTE service
and as outlined above, currently no MVNO's are allowed to use the LTE network. There are rumors this may happen sometime in the future, and at that time, MVNO's will have their own sim cards. Until that time, any flashing will be for voice,text etc and data will be 3 G only.
3. International use of the 822 can be used because it is unlocked.....but this is for GSM and not CDMA (The 822 can also be used in the US with any GSM carrier or MVNO)
Hope this helps !