How to tell if someone has an iPhone without texting them?

I have an iPhone 5c. I have this girls number, but I haven't texted her on this phone. I'm planning to text her soon and when I click the compose message button in iMessage and put her name In it shows up in blue, but instead of iPhone it says mobile. Does this mean she has an iPhone?

No i don't think she has an iPhone, not sure tho

You can't, you can send imessage to see but thats about it.

Yes.

It means that when you made the contact you didn't change it to iPhone.