How does it work?
"Membership of the BT FON Wi-Fi community is included with BT Total Broadband. All you need to do is say I'M IN. Then your BT home hub is automatically set up to become part of the BT FON network. This means that other members of the community can securely log on to their own Broadband account when they are in range of your hub's Wi-Fi signal In return for this, you can log on to your Total Broadband account whenever you are in range of either another member of the BT FON community's Wi-Fi signal or BT Openzones" -- beta.bt.com
And there's a support forum:
And, you can tell a friend:
"Don't keep BT FON to yourself. Get your friends to take part. The more people who join BT FON, the more places we can get Wi-Fi out of the home. Add their email addresses below to invite them to take part."
The snag with these options and communities is that they're local, and Option 3 is really required to experience the full benefit worth the cost. International travelers may not be included and may find the experience costly (that's if temporary opt-ins eventually exist). If BT partnered with broadband providers in other countries for international hotspot "collaboration-sharing", that would be beneficial. Currently, it's not necessarily a model that works for everyone.