u/Forsaken-Promotion42

I am on the unlimited plan with XFINITY mobile and the free for one year promotion. If I upgrade my plan for one month to cover upcoming international travel, so that I don’t have to pay the high fee for the global pass, can I downgrade back to the unlimited plan after the travel and still have it be free for the rest of my one year term? And is the premium unlimited plan still a thing with the new mobile plans?