I'm currently in Germany using an iphone 4s with the unlimited data sim from these folks and it works great! It took a few power resets on the phone after I landed before it picked up the signal, but after that it worked great. My iPhone is jailbroken, so I've been able to share my data via Tetherme with my gf's iPhone 3GS and she can browse and make talkatone calls while tethered to mine. Using talkatone app to make calls. I'll be headed to Spain tonight and will follow up.