READ_EXTERNAL_STORAGE: Allows an application to read from external storage.
READ_PHONE_STATE: Allows read only access to phone state, including the phone number of the device, current cellular network information, the status of any ongoing calls, and a list of any PhoneAccounts registered on the device.
WRITE_EXTERNAL_STORAGE: Allows an application to write to external storage.
Other permissions
ACCESS_NETWORK_STATE: Allows applications to access information about networks.
INTERNET: Allows applications to open network sockets.
