I want to that how can i intercept outgoing SMS.means i want to know that i want to send sms from my application but using default outbox and inbox.how it possible .
1) do you want to intercept SMS message made by some external party ?
2) do you want to make an application that send SMS ?
In case it is 1 you a looking for, there are some discussions about this made couple of months ago, so you could search them and read them
In case it is 2 you are talking, see GDSMS example. For more information about it and problems with it, search this forum and you'll get plenty of good advices,