I tried to use a calling card today (IDT is the provider, off the shelf, no activation required), I entered the pin and then dialed the number as prompted, and then I got a message that blocked calls are blocked, and to press *(whatever) to unblock my number before dialing. (This wasn't a calling card message, it was the standard one you get.)
This has never happened before. I thought the calling card company's outgoing number was shown. I call this person fairly often, and he's does have blocked calls blocked. Now I have to go buy a different card.
Anyone ever heard of this? Calls from calling cards being blocked?