Why won't my imessage on my iphone 4 work anymore?

My phone was fine in the morning the messages were blue like they should be and then around 4:40 my phones started sending messages in text messages instead of imessages. I have tried to turn my phone off and then back on but it didn't help. I turned the imessage off and then back on like 10 times. That still didn't work. But about 5:30-6 ish earlier today it asked me to login with my apple ID so i did and since then everytime i go to see if my imessage is on it says "waiting for activation"
what does that mean? Is my phone gonna be stuck like this? And i know its my phone because it happened to my boyfriend earlier but his go fixed along with his friends… And its starting to make me mad. Any idea how to fix this?

Make sure your imessage is on and give it time. Maybe turn off your phone and turn it back on.sometimes signal is just weird.last night my phone was taking lifetimes to send imessages even when i was on Wi-Fi and so was the person i was texting. It sent duplicates and was just being slow as all hell.so just make sure it's on and let it fix itself. Also make sure you have it updates to iOS 6 if you haven't already.

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My iMessage won't let me use my number why is that?

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I can't even get my Apple ID to get verified

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