For your other question about the risks being on free open Wi-Fi, read (a bit dated but still valid information):
http://www.boingo.com/blog/2011/01/is-free-wi-fi-dangerous/
and an official US gov warning:
http://www.usa.gov/topics/consumer/scams-fraud/computer-internet/wifi-scams.shtml

On the insecurity of open wifi: http://techtalker.quickanddirtytips.com/dangers-of-unsecured-wifi-hotspots.aspx

If you absolutely need access to the internet, pay a few bucks for the more secure option…

polonus