Blackberry curve 9300 on Canary 10 without bis works out at £5 per month for 24 months and so £120 over all for the handset, so essentially its a zero interest loan over a period of 24 months.
So without BIS you've got yourself a cheap Blackberry curve, or you can add BIS at a later point taking you to £10 per month.
The handset should be £149.99 but they will discount it to 0. You'd struggle to find a refubished pay as you go handset for £120, let alone a BNIB one,,
Thought this might be of use to someone who has an upgrade approaching with Orange, i forgot to ask at the time so im not sure if just being an existing customer is enough in this case, might be worth ringing up and applying some pressure..