App thats good for mass communication for a sports team?

Track Season for our highschool is coming up fast and as a team captain I need some help. Last year we used text messaging to send out reminders on when practice was cancelled, scheduled for a different place than normal, and to update our teammates on their event start times. This year I'm looking for an app that can do all of the above plus other things too. I have already considered google hangouts and celly but i'm not sure if the apps have a user joining limit. But this is what that app should be able to do.

1. Cross platfom app between Android and iPhones.

2. The ability for up to 40 teammates to join the app

3. The ability to upload documents and pictures and send them through mass communication.

4. The ability to send out a message that gets sent to everyone at the same time.

5. The app should also be very user friendly.

Whoever has the best app gets the best answer!

FirstClass

FirstClass is a viable option; however I do believe it costs money. Honestly, to be able to do all of the above: Facebook. Our schools IB program has a Facebook group created by a student and they use it to help people with Hhomework, study, or just to chat. Now, Facebook may seemed old fashioned and outdated. But I assure you that if you want to all of the above Facebook is just right for you. I don't know of any other apps that can do this. Also be sure to make the group private.

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