I
knew when I had been migrated over from
BT to
TalkTalk by just picking up the telephone and listening to the pitch / tonal quality of the 'dialing' tone.
The other way is, of course, to call
17070 once per day. Upon migration to a
TalkTalk fully LLU'd service, one looses access to the menu of
Beattie tests and just receives the "
This circuit is defined as . . . " message in a continuous loop.