VXMike, you're aware, aren't you, that virtually all electronics manufactured today are dual voltage/dual frequency and will work anywhere in the world? Certainly, your laptop will -- all you need are the correct plug adapters; no transformer necessary.

As for your cellphone, you can almost certainly get a dual-voltage charger for it, though most cellphones chargers are already dual-voltage. I always travel with lots of electronics and haven't encountered anything yet that can't just be plugged in the wall with the right adapter (though note that there are dozens of different and incompatible plug configurations used throughout the world).