Should i text my new roommates?

I just got my roommate assignments for my dorm! I have a triple(that should be fun… ) with two other girls. I'm super outgoing in person but for some reason I just hate talking to someone for the first time on technology, like I never know what to say…
I typed their numbers in(we didn't get last named, just first names and numbers) and they both turned blue so I think they both have iphones which means a group message should be easier. But neither of them have texted me yet… Should I text them or wait for one of them to? What do I say?

Any advice? Like I said I'm outgoing and once a conversation starts I'm fine, I just hate introducing myself over the phone, it feels weird.

Added (1). We're all girls and I'm straight, so I don't really care what they look like lol

Yes but as long as they're hot.

I would say just text them first. It was easier to meet my roommate in person once we emailed during the summer because I knew what to bring and what to expect when I got there (I was a freshman and she was a sophomore). Communicating with them now will make it easier once you move into the dorms, at least it made it easier for me.

If you don't really want to introduce yourself via text, then don't start it. Its nice to respond if one of them starts the initial text though. Its ok to want to introduce yourself face to face. And yeah, if a new message turns up blue after you enter in their numbers, then probably do have an iphone.