Do I have to change my number if I'm going overseas to Japan?

Question:

I'm with the Sprint network and I'm going to Japan for a while, I want to know if I have to change my number to call family and friends back in the USA?

Answer:

If you want to call your family, YOUR number does not matter because you have to call THEIR number.

Your number matters when they call you. So you need to make it more clear.