I live in Australia but frequently travel to the USA and Europe as my job dictates. (Global Express pilot)
An ongoing problem has been high roaming charges for data / internet when overseas.
I have a bag full of 3/4G devices from various countries and a dozen travel sims that work to varying degrees.
But I have finally found a really great "all in one solution"
A company called "Global Gig"
Globalgig - Low cost mobile broadband data in 40 countries or outside Australia
Globalgig ? Mobile broadband with no data roaming charges
They have two versions, a 3 G wifi modem or sim cards for use directly in an iPad / Android device.
I have been trialling both for the last month in the USA and am now in Italy and I have to say, they work great.
I have the 3G device, which connects up to 5 devices, and I also have their sim card in an iPad.
It works great in Europe, the USA and Australia, They have various plans but I have the "jet setter" plan on both versions, $49 per month for 5GB valid in 11 countries. No extra roaming charges.
Speeds are pretty good and I can watch Youtube without buffering 80% of the time, it is perfect for browsing and Emails. In the USA I was using Google Maps for navigating on an iPad and the Global Gig sim never missed a beat.
I don't work for them, but just sharing a great find. If you travel, this is the way to avoid crazy roaming internet charges.
It is only data, no phone calls.
I have tried many solutions and so far this is the best.