This is a fantastic app, easy and very detailed however, as one other user noted, be careful if you are upgrading to iOS 9.0+ . I am no longer able to enter new contacts, only edit existing ones. Several error messages appear and will not allow any new data. It will still manage time and placements however.
I uninstalled and reinstalled with no success. Emailed support a week ago with no response so am assuming that there is no fix presently.
Sorry to go about Field Service Assistant, v3.7.3