iPhone 5c frequencies by models- huh?

Hi. I am about to buy a new iPhone 5c for myself, and I am searching Amazon and other places for one. I do not live in the USA so buying one is not that simple, and I have to make sure it will work with the frequencies in Israel.

my question is, do all the iPhone 5c models work on the same frequencies? and if not, what frequencies does each model work on? can I have a list?

thx, Noga.

(the frequency in my cellular provider in Israel is 900, 2100 MHz.)