Hi i'm hoping to resolve an issue with my phone using o2 WiFi in Subway. I did post a similar post about 1 month ago but didn't get real solution. My phone can recognise that there is a connection there, and sometimes it loads the o2 WiFi free sign in page, but 9/10 times it's connected but has 'no internet connection'. I have downloaded the app and deleted my devices from o2 WiFi (including an old iPhone) and then re-registered my number. Lastly the frustrating thing is that sometimes I do get a connection but not for more than 15 mins. I actually work in the store and I've phoned the o2 helpdesk is working fine by the o2 WiFi techies and it has good strength and good speed.
