Since I will travel south america frequently this year, I need to port my number out from Mint to another career. My plan will end at the end of this month, but due to my work I want to port out at the beginning of next month. (I know I cannot use my number after my prepaid plan ends. It's OK.) Is it possible to port my number out after the end of the plan? Is there any special requirement? Thank you for your help in advance.