Mobile Backup will sync your contacts to you my.t-mobile.com account, while disabling your Google Account sync. Maybe not for everyone, but if you’re going to a non-Google phone or don’t use your Google account much, I can see how this would be useful. Or you can do a one-time sync, and stick with the automatic Google syncing. The app seems to suffer from the same thing as T-Mobile My Account, where you need to turn off you wifi manually before using it.

And Hotspot Connect will locate the nearest T-Mobile Hotspot and automatically log you in when you arrive.