SMS/imessage vs data? Need clarification?

I have an iPhone 5s and this question may seem a bit stupid to you, but I need some clarification. I don't have a data plan so I message with iMessage when I have Wi-Fi. But I also have unlimited texting which I didn't think mattered unless you had a data plan. So if I turn on SMS, can I text when not connected to Wi-Fi and it will just cost me the unlimited texting money or is it separate and I will have to pay more? Also, I know you can't message anyone without an iOS device when using plain iMessage, but if I use SMS, can I text any other phone that's not IOS and it will not cost me anything other than the unlimited texting?

You can text with regular message too to other phone. It will not cost you more money. You will only have to pay for your unlimited message plan.

If you do regular texting via SMS, it will count towards your unlimited texting money.

If you use SMS, you can text any phone and it will again count towards your unlimited texting money.

iMessage requires data connection through 3G/4G or Wi-Fi. Ensure your cellular data is off on your iPhone since you do not have a data plan. If you start using cellular data your telco will start billing you.

Texting does not use data. If you have unlimited texting, you can text anyone without worry on any network.

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