I love the excuses.
The business could pay the same amount of money for a Samsung Galaxy phone, a Sony Xperia, an LG G4, and an HTC with 32 GB of storage for the same price as the 16 GB iPhone.
Even then the purpose of a business cell phone is to have documents and e-mails stored on them, so 16 GB still isn't enough if you want to install the office suite and then save documents on them, and keep thousands of e-mails on the device.
Those who want a 4" screen and 16 GB of storage are the type that should just buy a flip phone and be happy. Why waste your money if you're just going to use it to talk and text?