/usr/share/icons/hicolor/22x22/apps/gsm-3g-full.png is in network-manager-gnome 0.9.8.8-0ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/icons/hicolor/22x22/apps/nm-signal-100.png
/usr/share/icons/hicolor/22x22/apps/nm-signal-100.png