My wife and I are on a Family Shared plan of 1,500 minutes, unlimited talk, text and web (apparently at 3G speed only). We both have the Blackberry Curve and are month to month.
If we upgrade our phones Sprint has informed us that we will have to pay an additional $10.00 per phone to keep unlimited data, even if we upgrade with the exact same phone.
I don't think this is fair as I don't care about 4G speed and don't mind the 3G speed but just want to get a different phone.
Check out a fun infographic that teaches you how to increase storage, enhance security, improve battery life and clean your device.