My Lumia 720 is O2, Cyan was available for it but couldnt DL Cyan as DP was blocking it, tried to downgrade to 8.0 but that only bricked the phone, took it for repair hoping it would return with Cyan and 8.1 but no, it returned with Black and a new serial number ! once set up i checked updates and Cyan and 8.1 downloaded and worked fine for a few hours, changed settings to get Cortana which meant a few reboots and the phone yet again semi hung itself, this time blue screen of sad face which really pi**ed me off, after a try with NSRT which failed i found a thread which showed the power, volumeup/down power reset, luckily it worked and came back to life, another DL of all apps and updates and i`m up and running with official Cyan and 8.1 on O2, no Cortana Uk Beta but then i am definitely not going back to DP, i would IF Ms hadn't screwed it up so much but now its totally screwed i`m out
and on a side note and totally off topic but i just cant see Ms sustaining WP for much longer, as much as we all love it and non or few of us want to use Crapple or Lagdroid Ms market share is soo low it just cannot continue, even for the mighty wealthy Ms, 18 months at best IF market share stays rock bottom, shame as i have absolutely enjoyed watching and using WP 7/8 mature and improve and with the death of "Nokia the great" i`m not sure where else or what else i would use ?? i guess lagdroid but never ever Crapple