How can I connect to free wifi hotspots with my laptop?

I’m talking about free wireless in cafes, pubs, parks etc. I have tried once and my laptop said it was connected but it wasn’t. Do I need anything other than the password of the internet service?
My laptop is pretty new, it has wireless lan and everything. At home I connect through wireless router.

You should be able to pick up the wireless network in a cafe or place were WiFi is available as long as you have a wireless card installed in your laptop. Check this website for more information.