Mauld,
Sounds strange to me. I had a similar circumstance when I tried to call a long distance number from my home phone (Sprint) and I got a strange recorded message saying that I used the wrong code or something like that. I then tried the same number on my cell phone (Verison), and the call went thru. This is the first time I experienced a difference in the phone carrier. Hopefully, this is the exeption instead of the rule.
DD