What is a good international texting app?

My girlfriend of over a year is studying abroad in Spain for the next7 months. Right now we're using Vapor and it's alright but I was wondering if anyone had any other good suggestions. I need something that is completely free with no hidden charges. It's alright if Wi-Fi is needed, that shouldn't be much of an issue.

Btw, we both have iPhones.Me an iPhone 4S and her a 3GS

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