The latest info on United Airlines mobile apps
The iOS apps from United Airlines will work with all of your Apple devices, from iPad to iPhone
Also, if you're a member of United Airlines MileagePlus, you can manage your profile, view your points balance, and more.
United Airlines has an Android app that works with most Android tablets, phones, and some Android Wear devices. 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.