Problem in application life cycle and handling the exceptions

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Mobile

Android

Hello guys

i have developed an android application that uses 3 major resources
GPS (Location), GPRS (Internet connection) , and External Storage .

the business of this application is to track the employees of company and also to
serve them as a task viewer system (they see their task and do some action with database and sending them to webservice ,...) the Tracking and Data Synchronization mechanisms are controlled in Services and other section are handled in Activities and Runnables

there is no problem in most of system execution time but in some situation (GPS or GPRS are not in a good coverage) or sometimes application stops and an exception happens which it forces application to close.

now i have putted many of important codes between try/catch block but exception is not geting caught. i have to accomplish something to make application always running. so
what can i do , I need to know what is exact code line raises error ?
(i must say that there is now way to debug it because when the exception raises the debugger does not show me anything about the problem or where exception raises up, actually i have tried with LOGCAT but there was no progress ).

please tell me any other way if you know.
tanks.