Oh I see, most likely I will be using an Orange SIM which is far cheaper than the roaming charges if I keep the Verizon SIM, and they will asign a new local number while I am in the Dominican Republic.Check which operator has bettero coverage/prices.
As for switching between the Verizon and the foreign sim in the phone - all you need to do is to switch from CDMA to GSM/UTMS in the wireless settings menu. It will alter between the two accounts.
Of course if you use Verizon's SIM - it will always use your verizon account and number (but with roaming fees)
So when I come back to the state, you are indicating that all I have to do is remove the Orange SIM and just adjust the CDMA to GSM/UTMS settings, right?