The calibre User Manual has:
The Device action allows you to view the books in the main memory or storage cards of your device, or to eject the device (detach it from calibre). This icon shows up automatically on the main calibre toolbar when you connect a supported device. You can click on it to see the books on your device. You can also drag and drop books from your calibre library onto the icon to transfer them to your device. Conversely, you can drag and drop books from your device onto the library icon on the toolbar to transfer books from your device to the calibre library.
I plugged my iPhone 4 into a USB port. ITunes recognizes the device. Windows Explorer recognizes the device. Calibre does not. If I shut down Calibre and reopen it, the Device icon still doesn't appear. Elsewhere Kovid says:
My device is not detected by calibre
Follow these steps to find the problem:
Make sure that you are connecting only a single device to your computer at a time. Do not have another calibre supported device like an iPhone/iPad etc. at the same time.
Check.
Make sure you are running the latest version of calibre. The latest version can always be downloaded from the calibre website
Check.
Ensure your operating system is seeing the device. That is, the device should be mounted as a disk that you can access using Windows explorer or whatever the file management program on your computer is.
Check.
In calibre, go to Preferences->Ignored Devices and check that your device is not being ignored
That option doesn't show up.
In calibre, go to Preferences->Plugins->Device Interface plugin and make sure the plugin for your device is enabled, the plugin icon next to it should be green when it is enabled.
IPhone isn't one of the listed devices.
If all the above steps fail, go to Preferences->Miscellaneous and click debug device detection with your device attached and post the output in this forum
Here it is:
Spoiler:
calibre 1.35 isfrozen: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
('Windows', '7', '6.1.7601')
Python 2.7.5
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
USB devices on system:
[u'usb\\root_hub&vid1022&pid7809&rev0011',
u'usb\\root_hub&vid1022&pid7807&rev0011',
u'usb\\root_hub&vid1022&pid7807&rev0011',
u'usb\\root_hub20&vid1022&pid7808&rev0011',
u'usb\\root_hub20&vid1022&pid7808&rev0011',
u'usb\\vid_046d&pid_c069&rev_5601',
u'usb\\vid_058f&pid_9360&rev_0100',
u'usb\\vid_05ac&pid_1297&rev_0310',
u'usb\\vid_05ac&pid_1297&rev_0310&mi_00',
u'usb\\vid_08bb&pid_2900&rev_0100',
u'usb\\vid_08bb&pid_2900&rev_0100&mi_00',
u'usb\\vid_08bb&pid_2900&rev_0100&mi_03',
u'usb\\vid_0bc2&pid_50a7&rev_0023',
u'usb\\vid_152d&pid_2338&rev_0100']
Unable to get free space for drive: K
(21, 'GetDiskFreeSpaceEx', 'The device is not ready.')
Unable to get free space for drive: J
(21, 'GetDiskFreeSpaceEx', 'The device is not ready.')
Unable to get free space for drive: M
(21, 'GetDiskFreeSpaceEx', 'The device is not ready.')
Unable to get free space for drive: L
(21, 'GetDiskFreeSpaceEx', 'The device is not ready.')
Drives detected:
No disabled plugins
Looking for devices of type: MTP_DEVICE
List of WPD PNP ids:
[u'\\\\?\\wpdbusenumroot#umb#2&37c186b&0&storage#vo lume#_??_usbstor#disk&ven_generic&prod_usb_sd_read er&rev_1.00#9205291&0##{6ac27878-a6fa-4155-ba85-f98f491d4f33}',
u'\\\\?\\usb#vid_05ac&pid_1297&mi_00#0#{6ac27878-a6fa-4155-ba85-f98f491d4f33}',
u'\\\\?\\wpdbusenumroot#umb#2&37c186b&0&storage#vo lume#_??_usbstor#disk&ven_generic&prod_usb_ms_read er&rev_1.03#9205291&3##{6ac27878-a6fa-4155-ba85-f98f491d4f33}',
u'\\\\?\\wpdbusenumroot#umb#2&37c186b&0&storage#vo lume#_??_usbstor#disk&ven_generic&prod_usb_sm_read er&rev_1.02#9205291&2##{6ac27878-a6fa-4155-ba85-f98f491d4f33}']
MTP device: \\?\usb#vid_05ac&pid_1297&mi_00#0#{6ac27878-a6fa-4155-ba85-f98f491d4f33}
{'device_version': u'7.1.1',
'friendly_name': u'Apple iPhone',
'has_bulk_properties': True,
'has_storage': True,
'manufacturer_name': u'Apple Inc.',
'model_name': u'Apple iPhone',
'protocol': u'MTP: 1.00',
'serial_number': u'881412MXDZZ',
'storage': [{'capacity': 15955132416L,
'capacity_objects': 0L,
'description': u'Internal Storage',
'filesystem': u'DCF',
'free_objects': 6471L,
'free_space': 9707487232L,
'id': u's10001',
'name': u'Internal Storage',
'rw': True,
'type': u'fixed_ram'}],
'type': 'unknown'}
Not a suitable MTP device, ignoring
No suitable MTP devices found
Looking for devices...
Devices possibly connected: None
Looks like the facility found my iIPhone but calibre doesn't like it. I have the Kindle app on my iIPhone. Any suggestions? Thanks.