"Application is for development use only. Continuing use may cause damage to your device." (Or words to that effect.)
I got this on my N97 mini while installing an app from our vendor (message was associated with an embedded sis file, apparently), and the installation then failed with error code 2153775105 reported in Ovi.
Am I correct in interpreting this to mean that the embedded application in the package is signed with a developer's certificate tied to a different phone?