yes it is true. I received the same call with that number 418-263-1511 and it is a friend from Uganda who was callind me, using Skype. There was 2 weeks ago, it was the number 418-263-1411. So it may change.
this number also connects with foreign phone cards. Well it's the number that appears when someone form honduras calls me up. Then, this number may be some "connecting" phone number for foreing calls?!