The latest info on United Airlines mobile apps
United Airlines provides an iOS app that is compatible with iPhone, iPod, and iPad.
For United Airlines MileagePlus members, you'll be able to manage your account from the app, though using their website will no doubt provide more functionality
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. You can get the same stuff done on the Android app as you can on the iOS app for United Airlines.
If you're just looking for their mobile site, you can head on over to http://www.united.com on your mobile device.