如果連左去人地屋企既無線但佢冇SET密碼,我用唔用得?

it's against the law "dishonest use of computer"

he can detect your connection using his router config web page.

當然係犯法，佢係路由器度，可以知道你用緊。

雖然絕少人因此警或被起訴，但係，你無謂為左慳百零二百蚊，因為咁樣坐監留案底。