Why does this person keep sending MMS to me without any other media attached? Just text?

So i met this person through my best friend and every single day since I met her she's been sending me "hey". Sometimes I chose just not to respond to them because I was either annoyed with them and/or had absolutely nothing to talk about. My life isn't interesting every single day, you know?

Anyway, lately for the past month or two I've been getting text messages that look like this: < no subject> Hey: with MMS underneath. I may be 23, but I'm an old soul and not a very text savvy person at all. I have also heard that I could be a part of a group text which really freaks me out. So, what does it mean?

Added (1). Quick update. After every text from her that looks like that, a pop up displays on my screen that says send read report. I have an android and she has an iphone. The last time I checked. How is that even possible? I think it's freaky.

Added (2). **I'm sorry. I mean what is the function or purpose of it?**

None of us can possibly know exactly what this means.

Please call or text her and advise her not to send you these short and meaningless messages. Inform her that you're ready to engage her in a proper adult conversation, if she sends you meaningful texts directed at you personally.

More info?

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