Use Of Speed Tones

[StephenM]

On my 2007 IS250 I've set up the various Speed Dial numbers but I'm wondering has anybody successfully set up Speed Tones?

My understanding of the usage of speed tones is that you're able to to assign different ringtones to several different incoming numbers. However, when I tried doing this and registering the different numbers there was no difference in any of the ringtones assigned. I had my car in for service today and unbelievably even the service guys couldn't make it work either.