Can I Use MIDIjet Pro USB with iOS Devices?

You can use the USB port on MIDIjet Pro USB with any iPad through Apple's Camera Connection Kit (30-pin) or the Lightning to USB Camera Adapter.

Apple will not allow iOS on iPhones to use either connector to power or connect to USB compliant devices at this time. 

Workarounds for iPhones include iConnect MIDI, IK Multimedia's iRig