Install the Summon Driver app in your iPhone's internet browser by going to www.summon.com/driverapp. You should not be using the Summon iPhone app available from the Apple App Store.
You must have an iPhone 4 or newer, and at least iOS7 in order to use the Summon Driver app on your iPhone. If you do not have the proper equipment, read about your options here.
Access the Google Play Store from your Android device and search "Summon Driver". If you do not immediately see the Summon Driver app, choose More. Install the Summon Driver App directly here.