Is it Stealing to Use Someone Else's Wireless Connection?  

Using an unauthorized WiFi connection for one's own use when it is not owned by a person is called PiggyBanking. It is a common act in many places. It is not exactly like stealing electricity, but you see bad luck to the neighbor who has to pay extra every month for the broadband which she does not use.

Well, it depends. If the reason stated why there is no need to pay for ISP was because she lives in a subdivision, maybe it is an additional feature to those who live in that particular subdivision, just like on some restaurants and other establishments. Or if it is true that she is going to use an open wi-fi connection from her neighbor, maybe there is an agreement between them to share connection for free and in this case, it would not be considered as stealing as there is authorization by the owner of the router. Or maybe the owner just want to let the connection open for all without protecting it by a password. Anyway, just try asking her for more details why she don't have to pay for internet connection.

its fine if she has a permission to use the connection

No, not really because what your friend is using is WiFi or wide fidelity. It has 10m radius and your bill here is fixed. You are not paying by bytes sent and received unlike in electricity bill where you pay according to your consumption. We cannot really call it stealing because this technology is designed to be used by as many people as possible in neighboring places. I also use it at times because it doesn't affect the owner whether I use his connection or not. His bills will stillbe the same because it is on monthly subscription.

i Don't Think so..
but if he/she dont allow you to, i think that stealing..
but he/she dont mind it. of course it's not..
enjoy using free connection.. :)

well.. if that person haven't put password protection then its fine... that person should put password protection if he don't want that other person use his internet.. so its not like stealing. but if wifi is protected with password means authorisied then we should avoid it.