Use a Negril phone in another country

[MissBlue]

when I get to the DR, i purchase a SIM card and then my phone will work?

possibly - but that all depends on their local network and if it will work with your JA-purchased phone; depending on the specific brand & model of phone, it may not be compatible. You'll have to ask the Digicel people when you get there. If your phone can work with their network, then yes, you would just install the DR SIM into the phone.

I will have a DR phone number for the week and will be using DR minutes not the JA minutes I've already earned?

- yes, if their local SIM will work in that specific model of phone -- it may not; all depends on their network and setup there.

Then when I get to JA, I just put my JA SIM card back in and my JA phone number and minutes will be there barring no other unforeseen circumstances.

If all the above is successful and you've used a DR SIM in it while in DR, then yes... because your JA minutes are loaded on your JA SIM, which you will remove from the phone - so they should not be affected.