From aa-asterisk.org.uk wiki
09 numbers are Premium Rate Services, i.e. those that cost over 10p per minute to call.
Some services do not require registration and some do, possibly with payment of a bond. Many PBXs bar calls to 09 numbers due to the high cost of calling them.
Types of 09 number
- 0901-0907 - Premium rate services
- 0908,0909 - Adult Sexual Entertainment services (not available for new issue)
- 0911-0917 - Premium rate services
- 0982-0989 - Adult Sexual Entertainment services