AT&T - Great customer service
mobile plan - Compliment
I thought I had my international call blocked on my wireless plan. But not really true as Canada is not really considered international as far as long distance is concerned. The fact US and Canada both have same country code 1 -- make this blocking difficult. I am aware my plan does not cover Canada long distance. With an iPhone4S, I can install Google Voice/Talkatone apps to make Canadian call free, and it can be even done on WIFI, so it will cost no air time.
However, I accidentally click a wrong button and used my phone dial pad to make an hour long chat with a Canadian friend. Later, I saw the charge of $40 on long distance. I called AT&T Customer Service, and they were very friendly to explain to me the international block function which does not work for Canada. They waived this $40 charge due to my mistake.
I have been talking to AT&T service a few times, and they all seem nice, helpful, forgiven and generous.