You could get something like an AOL dialup account as they tend to have local numbers in a lot of counties (but that could mess up your other network settings).
A better solution would be to use iPass
http://ipass.worldial.com/ who offer a number of business ISP services from 150 counties. You can dial-up using a PAYG phone number (if you are paying the bill) or a freephone number (if you are not paying the bill or are in a hotel room, etc.) and you get billed per minute usage.