My jailbroken iPhone4 with ATT's unlimited international data. It functions as my travel router most of the time, my alarm clock, my gym buddy, my camera, my main VOIP tool, my restaurant finding tool, my navigation tool, my global "satellite radio," etc.

In May of 2009 when I switched from Blackberry International to iPhone, I did a serious list of the apps I needed/wanted and compared iPhone and Android. At the time I had to give the nod to an iPhone. Android has matched it (without having to deal with the jailbreak). If I could do it over in 2012, it would be tough -- Google's free worldwide GPS would be tempting and as I pointed out in another post, it does better VOIP.

My iPad is also great. It is my Kindle, global newspaper/magazine subscription, television, speakerphone, etc.