You can use the bike with any smartphone that is compatible with our app.
The Cowboy app requires an iPhone 5S or newer and supports all the OS versions as of iOS 11.
On Android, all versions as of Marsmallow 6.0 are supported.
The best way to make sure your phone is compatible is simply to go to the App Store or Google Play, search for "Cowboy bike" and download the App.
If you want to use the Qi wireless charging option of the Cowboy 4 you will need a smartphone that is compatible with wireless charging. You can find a list of phones that have wireless charging here.