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Originally Posted by levig
well I guess that your going to stay at a hotel in Brazil or in the USA...most of the hotels now adays have wireless setup in their premises you just have to check at the hotel if there is a wlan available
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I agree wifi access is becoming more and more common thesedays and would be your best bet for net access while away from home. Its increasingly common in airports, stations, cafe's thesedays so hopefully you'll be able to find a hotspot somewhere.
http://www.jiwire.com/ seems to have some tool to find hotspots (although i have no idea if its any use i just googled wifi hotspot finder and thats what came up)
, if you really do have to fall back to dialup its worth trying for a local isp (i mean some isp such as their eqivilent of our 0845 isps). calling international will end up costing a lot more.
not sure if you'd be able to use one of those international calling cards with a modem

(e.g alpha telecom .etc) but it might be worth looking into.
mobile data is another option but as you already pointed out its very expensive at the moment, as the tech advances hopefully it will become faster and cheaper.