Yes, with iOS only for versions above 5.1.1.( 3GS or newer). Mobile devices that use iOS version 5.1.1 or lower are not compatible with the File Upload feature. This due to the fact that file upload fields use the input type file which is not supported on all mobile browsers. If possible, upgrade your iOS version in order for the File Upload field to work on the online form.
For Android devices you will need at least Android Froyo, version 2.2 of the Android mobile operating system.