Please note that due to the limitation of iOS, iOS devices can be the controller only.
To control Android devices from iPhone, you need three steps only.
1. Download and install TestFlight app from APP Store.
2. Copy this link biz-ios.airdroid.com, and paste it on your iOS device's browser to join the AirDroid Business Beta project.
3. Click Start Testing and install AirDroid Business on your iPhone.