You can bypass some airport wifi that's been setup not so secure. Pretty handy for phone calls, why is it usually £20/day for a wifi spot in Brazil, who pays that? Truth is you're only using it for a few moments to check a few things and to save money, so there's no point in paying for that is there?
The best thing to do is get a local simcard with pay-as-you-go 3G internet on it, then you got it all... in theory. Yes it's a pain to do when you pass through 3 countries in one day & eeception is a problem in every country but it's possible.
If your job is online only, it's perfectly possible to roam the world. The only thing is in practice reception makes this not so good in reality. I'd love to make this my reality. Is this how you run your life? -I'd love to hear from you.