IPhone 4S won't send text messages?

My phone can go on the Internet and connect to Wi-Fi, I'm actually writing this question from the phone itself.
When I hit 'send' on a text, it starts sending, but stops midway and says "Sending 1 of 1" underneath the contact's name at the top of the conversation thread. It started yesterday and hasn't sent a message since. Calls are functioning as they should, it's just text messaging. What's wrong with this thing? Is there an obvious fix that I haven't thought of? Or do I need to take it to Apple (last resort).

Just call your phone company. It's nothing to do with anything on Apple's part. Since it's just text messaging, it's your carrier. Should be a simple easy fix.

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