Location awarenes on the iPhone app would really improve its functionality. It would be great to be able to automatically assign jobs to maintenance staff who are currently at a specific site. You could also allow the staff to view all jobs pending for the current location. I would see this as also being handy in the ServiceCentre Plus application (we use that ourselves) too as we often send service staff to do a regular visit to a client and having a quick list on your phone of issues pending for that site would provide added efficiency.