I can't iMessage on iPhone 4?

I got an iPhone 4 last year and it had a blue bubble. But now the bubble's green. I don't know why? It says text message and I turn on iMessage on settings but it's still not blue. My friend also has an iPhone 4 and has iMessage on too. How can I make in iMessage and blue?

Get a texting app prob sloved

Whoever you are msging doesn't have it on or it would turn blue.

Try turning your phone off. Wait 10 seconds and turn it on. If it doesn't work then try turning iMessage off and on again or contact your Carrier's customer support.

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