The only *true* way of remaining anonymous is to piggyback off of a neighbour's unsecured wireless connection.
Communications Act 2003
Computer Misuse Act 1990
Not a good idea.
And anyway, if you kept on using the same neighbor's connection, you would not stay anonymous for long !
precisely so as to spy on any traffic
Indeed.
It's known as a man in the middle attack.
And don't think just because you're visiting a "secure" page such as online banking you're safe. The man in the middle can intercept the secure communications, effectivley relaying on your behalf and capturing passwords and everything else in the process.