When I travel from the US to Israel, will I need to use a voltage converter when plugging in my iphone to charge?

The Apple charge cube will accept voltages from 100-240 volts @ 50-60hZ, thus no voltage conversion I required.

If you are using the Apple supplied charge cube, you will simply need a plug convertor for the local power system.

Read his response again, he already answered you. The Apple power adapter is dual voltage, using and adapter kit so you can plug it in will not change that.