I called for clarification for the different offerings for the iPhone users through AT&T, and this is what I found out:
AT&T World Traveler
99 cents per minute in France, Italy, and Spain
$5.99 per month, can be prorated. You can have a start and a stop date added by calling in.
Texting
You may receive incoming texts up to your current domestic plan's allowances, with standard incoming overage rates. Outgoing text messaging is 50 cents per text message OR an international plan for a $10 charge for 50 messages. If you exceed, each incoming text message is billed at .20 each, and outgoing is .40 each.
Data exchanges
Two options - connecting to wifi hotspots *is* free, even at Luke's friends house. If you do not want to look for a wifi hotspot, or are concerned about connection or security issues, you may also add on one of the new international data plans; 50MB for $24.99, 125MB for $49.99 or 275MB for $99.99.
iPhones receive data constantly, and international rates apply to this transfer. To end transfers internationally, be sure to go to your settings and turn OFF
both data Roaming and Fetch New Data settings. If you turn on your wifi, you can still see the hotspots and go in and manually download.
I hope that this helps. When I travel in Mexico, I usually get the data plan since connectivity and security has been such an issue for me in the past. I've done a bit of research on wifi hotspots at the ports we are going to and watching the correspondence from the EU folks and thinking I may forgo the data package this time around. I have noticed that not all wifi hotspots are free. I figure I can always add it by dialing 916.846.4685 while outside of the country to reach AT&T international services and add it.
I hope that this helps the iPhone users. For more information, please see the following link:
http://www.wireless.att.com/learn/international/roaming/affordable-world-packages.jsp