How mobile-friendly is Frontier?
Like many other airlines, Frontier offers an iOS app for all of your Apple devices.
Also, if you're a member of Frontier EarlyReturns, you can manage your profile, view your points balance, and more.
As the most popular mobile platform in the world, Frontier has taken notice of Android and provided an app for most Android devices. You can get the same stuff done on the Android app as you can on the iOS app for Frontier.
If you're just looking for their mobile site, you can head on over to http://www.frontierairlines.com on your mobile device.