Why do some people not get my text messages properly?

I recently got the new Galaxy 6 Active and before had an Iphone4s. So yes I really stepped forward in time. I have two people that I text regularly that have dumb phones...meaning they're still in the flip phone and slide out high school texter keyboard era. I don't have problems sending messages to my other friends with smartphones so i'm not sure why it happens with the others but with the flip phone all they ever get when I send a text is "page" and that's it. With the slide out phone they only get half of each sentence and never gets numbers or symbols. Is this a problem that I could easily reset in my phone or will I have to just call these people from now on?

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