When Googling a few months ago, I accidentally discovered the Aangel service. I know it's been covered in these forums as well.
In brief, Aangel (pronounced Angel) allows you to dictate calendar entries, tasks and notes over your phone. Operators enter the details, and you receive the info back in the format appropriate to your particular phone and PC-based organiser, such as Microsoft Outlook or Lotus Notes. It's really convenient and the service works well.
The calls are charged at your regular Vodafone rate, but the texts back from Aangel are supposed to be free.
Recently I changed to one of the newer Vodafone plans, so I was monitoring my bill on-line a bit closer than usual. I was surprised to note that every text I was receiving from Aangel was costing me $1.
I called Aangel about this, and they were really responsive. They took the matter up with Vodafone on my behalf, and kept me informed regularly about progress.
I'm advised that Vodafone have now found the glitch and are working through how customers are going to be reimbursed for the billing error.
This sounds like another bedding down issue with the new billing system.
So if you are an Aangel user, it might pay to see if you've been charged by Vodafone when you shouldn't have been, and to watch for some kind of credit on your account.