Hey gang-
Well- just got back from Rome- my 3rd trip to Europe with my UM phone. I'm glad to say that my callback success rate with CBW was day-and-night different from what I experienced in Venice and Zurich. I got my callback on the first try on each of 7 different occasions. Only once did I have to try a second time. I was using the ITIM network, which interestingly gave me dismal results in Venice.
Anyhow- I'm crossing my fingers that this will be the rule and not the exception!
Dave