For iOS crash reports, it is sufficient to drag and drop the crash report to the Organizer.
Symbolicating iPhone App Crash Reports
But this method doesn\'t work
@inkjet 's comment above deserves its own answer. He built an app that does a full symbolication from your dsym and .crash file.
A free alternative to Sumbolon that I made: bch.us.to/apps/macsymbolicator — It uses atos in the same way described by Rich Able below. – inket Dec 24 '13 at 4:39
putting it all together:
download Mac Symbolicator from here
Open Xcode, select Window->Organizer, goto the Archive tab and find the version of your app that experienced the crash.
Right click on the app archive and select "Show in Finder"
Right click on the .xarchive, select "Show Contents" and find the AppName.dSYM directory
Drag your .crash file and AppName.dsym to Sumbolon
Magic happens