Global Roaming

Geir Communications
International service provider offering prepaid billing plans that allow for global roaming.
http://www.net-roamer.com/

iPass
Runs a large global remote access network allowing connectivity to the Internet, email and corporate networks.
http://www.ipass.com/

MaGlobe Inc.
Provides worldwide prepaid Internet access for users that travel abroad.
http://www.maglobe.com/