Call Diversion Immediate
To activate, press * 21 (number diverting to) #
To de-activate, press #21#

Call Diversion on Busy
To activate, press * 24 (number diverting to) #
To de-activate, press #24#

Call Diversion on No Answer
To activate, press * 61 (number diverting to) #
To de-activate, press #61#

Enable Call Waiting   *43#

Disable Call Waiting   #43#

Ring-back number (land-line only)
127 22 199 
(Dial the number, hang up and your phone will then ring after a short delay)