I updated my Mastercard records with my new "home" phone back when I
> got rid of the land line, but apparently the system they have for
> activating credit cards can't deal with cell phone numbers (the human
> I eventually got to talk to told me they are woking on it).
> I know my phone generates valid caller ID, since I've seen it show up
> on the phones of people I called. I also know FPL's power outage
> automated system can recognize me when I call and correlate my
> cellphone to my home address to tell me about the state of any power
> outage, so I gotta wonder what the difficulty is at Mastercard. --
It's likely that they're using ANI which may show the number your cellphone is using to outdial rather than your actual number.