Originally Posted by
xyzzy
Why not get a US prepaid T-Mobile SIM for Colorado and a European prepay SIM for the others? You'll have to check the rates on the European SIMs as some are great and some are lousy.
This sounds like the best advice. The callbackworld.com system sounds like a nice way to manage intra-europe roaming costs if he buys, say, an Italian SIM and wants to place a call from Germany.