Using cell phones in the foreign language classroom?

I thought this looked like an appropriate topic for me because I am trying to implement this idea in my classroom.  I teach at two schools and my advanced classes are very excited to try it.  One student has asked me every day for the last two and a half weeks when he should bring his cell phone.   I want to make sure the first experience is a great one, so I have waited.   I have only approved it with the principal at one school (cell phones are a no-no from the beginning of school until it is over) but I am sure it will be approved at both schools if I can prove its relevance to my curriculum.  I think the possibilities are limitless and it creates real world applications that are hard to create in a classroom setting.  I hope there is enough research out there to support a research paper.  After our class (3610) today, I am a little nervous about the quantity and quality of research available.  I guess I'll see what I can find.