Why won't my iPhone send iMessages? - 1

So ever since I updated my iPhone 4s to iOS7, I have only been able to send iMessages to a select few people. I'm doing an exchange this year, so I need to text my exchange student, who lives in Spain. It costs $0.25 per text, which adds up and I liked being able to do it for free with iMessage. I used to be able to use iMessage with her. I tried Resetting my Network Connection already, but it doesn't work. What can I do?

Http://support.apple.com/kb/ts4268

Do the steps where it says it will not activate after 24 hours.

They said they are working on a patch as some are affected using iOS 7 with imessage.

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