Help me with this tough choice?

[iKNOWSOMETHINGS]

I am a 21 year old Junior in college and I do not have a smartphone. I want one really bad, and yesterday, before this important meeting, i called my ma to get advice on my outfit and she told me I could go ahead and the order the Galaxy S III. I was sooo happy. So i went to my meeting with a ginormous smile on my face.
While at the meeting, I learned the dues for membership exceeded 400$ that I would obviously have to obtain from my mother. But I would never consider asking her for both, she has given me a lot that is why I need help deciding which to choose from.

Background. The organization is actually a national fraternity dedicated to community service work and uplifting our youth. They do a lot of work with soup kitchens and I want to open up my own, soup kitchen, after graduation. so by joining I could actually meet someone who could help with that,

With the phone, people laugh at me for having a flip phone still lol and I always miss important information because I have to come back to my laptop to check my email, Facebook, and twitter. The most recent mishap was when I missed out on free battle of the band tickets and t shirts, my school was giving away. and my accounting class makes us do research on our phones in class, and i'm always sitting back, waiting on my friend to find the answers. and I would like an instagram =.)

In short, this is my dilemma, should I get the phone or join the fraternity?
Thank you in advance.