When you connect to a bt openzone, the o2 advisor is correct. It will take you either to payment page or to a mobile zone page. Ive connected to a few where i live and it comes up asking me which network im on. I choose o2 and thats it. If o2 isnt listed or you choose o2, it will say that you cant use this service which means that bt openzone

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BT Wi-fi – Apps on Google Play

I am trying to connect my Kindle to BT Openzone. I read the help item on this and followed the process outlined but all I get when I click on "connect" is a message that says "Unsupported Wi-Fi network Enterprise or peer to peer Wi-Fi networks are not supported. Try connecting to other networks" T Free BT WiFi Account - YouTube Jan 29, 2018

You can as you probably know connect free to any of these while in credit. Some hotspots are BT Fon, and many are privately owned, but still show as BT Openzone. O2 are also setting up free wi-fi for everyone later this year:

How do I connect to Bt openzone - O2 Community