How mobile-friendly is United Airlines?
There is an iOS app from United Airlines which will work on your iPhone, iPod, or iPad.
Also, if you're a member of United Airlines MileagePlus, you can manage your profile, view your points balance, and more.
The Android apps from United Airlines work with all Android phones and tablets from various manufacturers (Samsung, LG, Google, etc.), and Android Wear watches might also be compatible. As is often the case, the Android app offers the same functionality as the iOS app.
Also take a look at United Airlines's website by clicking here — you should be able to do what you need there.