Going to Europe for 10 days - and will only have WiFi service on iphone 4s (carrier is Verizon Wireless). I was looking for a third party application where I can use text messaging to those back in the U.S. I can not use imessaging for those who do not have an iphone. I really don't wish to use or get a Google Voice number to accomplish this. Looking for suggestions. Again, will have WiFi service - looking to text without using 3G. Thanks.