What isn't my iMessage working?

My iMessage randomly shuts off sometimes and turns into text messages and when I turn it back on, it either doesn't work or it works on some ppl and not others with iPhones. Anything I can do?

Keep in mind that for iMessage to work, both people must have iPhones (obvious) have iMessage turned on (some don't use it), and both must have an Internet connection; whether it be Wi-Fi or cellular. Just because you have an Internet connection doesn't mean the person you're texting does as well. So if you both don't meet all of these requirements it will use text messages instead.

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