I'm on Vodaphone. Like most people I sometimes receive a voicemail from somebody who, before I can pick it up and listen to it, manages to subsequently reach me, thereby negating the need for me to listen to their voicemail message.

However, when their message comes up for playback when I'm going through my pending voicemails, and you attempt to delete it within three seconds of playback - like if you are in a hurry to get to the next message - playback pauses, there's a few moments of silence and then the voicemail lady comes on and says, very slowly, and purposely, and slowly - did I mention slowly?

"It is not possible to delete a message within three seconds of playback commencing."

or something long and wordy to that effect before returning to playing back the message - at the beginning again, thus rendering your attempt to save precious time into something which actually delays you even longer. I swear I can hear her smirk when she slurs out her delaying tactic, and she gets me with it every time.