How can I reduce the cost of my phone bill while I'm in the US for 4 days?

I have an iPhone with Rogers (Canadian carrier) and I’m going to Orlando on thursday for 4 days. I am a new subscriber, and I get everything free until the 4th of June, which is the day I leave, go figure. How can I reduce my long distance bill. I know that if I call an Orlando number when I’m in Orlando, it counts towards my regular minutes and isn’t charged extra, but I might call home, which would cost extra. I definitely plan on using my data plan, which is 1GB. I don’t wanna get a new plan. I have a phone that has an American SIM and would be cheaper, but I have my life in my iPhone, and it would be weird to carry 2 phones while I’m at Universal Studios.

Does anyone have a good solution to this?