Probably BTOpenzone? I would think that's the default SSID ( wireless network's name) for the standard BT domestic broadband product. There have been various attempts at using people's domestic WiFi to provide a free large scale network, but I don't think any of them have taken off in the UK. I live in a fairly rural area, admittedly on the edge of a village, and can often pick up half a dozen networks, most of them are secured these days.
When we're going on about 'dialing in to the router' or suchlike then we're talking about accessing the router's setup information, which is done via a normal web browser. Netgear and DLink for example generally use 192.168.0.1 as the IP address of the router''s internal homepage. Not a good idea to muck about with the settings if you don't know what you're doing.
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