"It is true if their broadband is unsecured - most people these days (particularly in a housing estate) will have security. Anyway, if you connect to their signal it's theft"
BT have a system where, in addition to providing users with a secured WiFi connection, their routers also broadcast an unsecured signal which is available to any other BT broadband customers. Additionally, a connection to the unsecured network is available to non-BT customers by purchasing a daily or weekly subscription to the service.
Recently, when away from home in an area where I couldn't get a 3G signal, I was able to get online via someone's BT router by purchasing a weekly subscription from BT. This use of someone else's router is, of course, quite legal.
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