Sorry for the delay.
That is good to know for international use, I hope to go abroad again soon, but when I do, I'm definitely going to get service before traveling. I wish T-mo had this service last year, I really could have used it on my tour of Europe.
For some strange reason, ping >150ms makes some iPhone apps really sluggish (on Sprint/Verizon) I mentioned Facebook because I use it to post photos whenever I travel/go on adventures.