Question

 Is it legal to connect to someone else's wi-fi?

Answer Short answer; no, it's illegal to do so. There's various BBC News articles on the matter which you may wish to check; one of which I've posted.
http://answers.yahoo.com//question/index?qid=20080817071353AAbLGAM

Top Q&A For: Is it legal to connect to someone else's wi-fi

Is it illegal to connect to someone elses wifi?

It's a crime to hack someone's encryption - that's an unauthorized use of a network.If someone leaves their network wide open, that creates an implication that they don't mind other people using it... Read More »
http://answers.yahoo.com//question/index?qid=20110623124025AASbvTP

If you connect to someone elses wireless, do they know it?

Yes, but if they knew how to do that they would have a secured network already.So enjoy it as long you can.
http://answers.yahoo.com/question/index?qid=20071115091833AAH7MvR

Can you take a eye out and put in someone elses eye.?

the question and answers just made my day
http://answers.yahoo.com/question/index?qid=20070614130239AAOLmvw

Can you buy insurance on someone elses car?

Absolutely. Insurance companies are in the business to sell insurance but the insured will be the driver of the car. In other words, a person driving the car is the "insured driver" There could ac... Read More »
http://wiki.answers.com/Q/Can_you_buy_insurance_on_someone_elses_car


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