If you are a Communications Provider and wish to offer premium rate services you should register with icstis prior to using or dealing any of the '09' number blocks.
Once you have registered, icstis will contact you to discuss your forms and arrange an induction programme for you.
If you sub-allocate, transfer or port any numbers obtained from Ofcom you should advise the recipient of those numbers of their obligations to icstis, particularly those that are triggered prior to the using or dealing with any premium rate numbers.
Failure to register promptly may lead to a formal icstis investigation. If revenue is generated on these numbers prior to registering with icstis you may be liable for icstis levy payments resulting from that revenue.