Is there an app I can use for international texting?

I'm in the united stated and my girlfriend is in Israel, I have an iPhone, she has a basic phone with no data plan, is there an app that I can send and receive messages with her? If there are any hacks out there it'd be greatly appreciated thanks!

Viber or Skype I would think. Not sure of the in-app purchases now. There are some newer ones. See below. Best luck.

http://appcrawlr.com/ios-apps/best-free-apps-free-international-texting

http://www.rebtel.com/en/International-Calling-Guide/Texting-SMS/International-Texting-Apps/

https://itunes.apple.com/...88432?mt=8

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