Brighthand: Best to stick with the AT&T edition of the iPhone if you want to make phone calls in Europe and much of the rest of the world.
Device Index GSM
The GSM code was vulnerable even before the recent hack by Karsten Nohl made headlines across the world. We highlight services you can use to keep calls secure while the issue is being evaluated by the GSM Association.
German researcher presents findings purporting to demonstrate weakness of GSM standard.