IMessage isn't working no matter what I try?

So I have the iPhone 4 and I'm using ios 5.1 trying to text my boyfriend who has the same, iphone 4 ios 5 yada yada yada. I'll try to send a text thru iMessage but it won't go… Then i have to send it as text message. And this repeats for the whole day. All of a sudden my iMessage will just stop working. It will be fine all day, and then just stop. Its So annoying! What can i do!

Check the back of your phone, what do you see?

You should check your Wi-Fi connection. That is because iMessage runs through Wi-Fi so if there's a problem with it, that could be affecting iMessage.

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