Firebase, Simultaneous Connections?

I am developing an Android App working with Firebase Real Time Database, I've read that only 100 simultaneous connections are allowed , but what happens when the 101th device try t

Solution 1:

When 101th simultaneous connection occurs, Firebase will wait until one connection is closed and only when a connection is closed it will use your new connection.

Keep in mind that you'll don't have a temporarily shut down until you upgrade your pricing plan. Your database will still work for sure.