IMessages consistently going through as text on iPhone?

This just happened last night. All of a sudden out of nowhere my iMessages started sending as texts and it's STILL doing it, I don't get what's going on! I took it to Verizon and of course they know nothing. I reset my phone, went through every option available but nothing! It's still doing it. What is going on and how do I fix it?

Added (1). Clearly you arent understanding. Everyone I message has iMessage on their iPhone, how do you think I noticed this problem in the first place…

It will always send as text if you are sending it to anyone that doesn't have an iPhone with iMessage.

Did you maybe accidentally turn your iMessage off? If you look under settings and messages it gives you that option… (off and on) That's the only thing you can do to fix it (if that is the problem) the only other reason I could think of for that happening is if you or the person you are trying to text does not have Internet service or the service is limited, it will then automatically convert your iMessages to text messages.

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