MindYourService

MYS for iPhone and iPad includes the following functionality:-

+Access to all your jobs (work orders)
+Signature and image capture
+Bar codes
+Create a job
+Custom electronic forms
+Asset management
+Stock control
+Task management
+Customer management
+Invoicing and payments
+Offline functionality
+Real-time location tracking for field workers
+Receive notifications of new jobs (including audible beep)

"Continued use of GPS running in the background can dramatically decrease battery life."