Do you have an Android phone? Do you like viewing your account and changing account settings on the fly?  Then this update it for you.  T-Mobile has updated the App to include two menu icons, My Account and Help, and it now allows you to switch to paperless billing or make payments using previously stored information.  They also added some extra security, making you sign in with your My T-Mobile password or the last 4 digits of your social security number.  You can find the update in the market, but chances are you have already received that notification, maybe.