if you just connect to an unsecure network and view a few pages, maybe download some stuff it should be perfectly fine. firstly if its unsecure then theres a good chance they are noobish so wont even realise your on their network, 2ndly if they do find out they probs wont care or will put wep/wpa on the router, i doubt they will go to the police because someone stole less than 1% of their bandwidth, especially when a lot of people have unlimited.