Wifi security

Hello, I have a psp system and when we drive through the city I can pick up multiple wireless networks, some unsecured. Is it legal to use these unsecured networks?

It depends.
If you don't "hack" to be able to use one of those networks than it is not your fault that you can connect through an unsecured wireless network. It is the network administrator/owner's fault. You just connect "accidentally" through that network.

That depends on what country you live in, but I wouldn't recommend using other peoples unsecured network. Beside the possible legal consequences there's also the moral issue of leeching on a service that someone else is paying for.
http://www.dslreports.com/faq/13052

There have been successful prosecutions in the UK under the Misuse of Computers (or whatever it's called) Act.  Don't do it.

Besides, some such "unsecured" networks are in fact "dirty" networks which exist purely for the purpose of stealing data from anyone foolish enough to connect through them.

There have been successful prosecutions in the UK under the Misuse of Computers (or whatever it's called) Act.  Don't do it.

Besides, some such "unsecured" networks are in fact "dirty" networks which exist purely for the purpose of stealing data from anyone foolish enough to connect through them.

Rob is right (I forgot to mention these aspects in my previous post). But a psp system (isn't this a gaming console?)... What personal info would have recorded on a psp?

It doesn't need to be on the console - remember that the data transmitted during a web transaction (credentials entered into online banking for example) would be of considerable interest to a packet sniffer.