Got activation email from xilo this morning but still able to connect to O2
IPStream <-> IPStream ~
Which ISP you can connect to depends upon something called SSB (Service Selection Barring). SSB and stage 1 Authentication is carried out at the bRAS, so in effect all BTw do is change on their records which ISP you are allowed to connect to. Sometimes there is a slight overlap where for a couple of days you may be able to connect to both ISPs until the migration has been fully completed.
do I just disconnect and try to connect to xilo?