f4f80898_Mobile_Development__Budgeting_considerations
[Technology] Symbian [Budgeting considerations] 
Probably the most difficult to master, and thus expensive, but also rewarding. The software is reliable and has a solid reputation. Consumers are willing to pay more for Symbian. You will need a commercial development tool, which adds to the cost. Further, some distributors only accept tested applications, so you’ll have to use a third-party testing company to do the testing. And in the latest version of Symbian, you have to get your applications signed.
Mobile Development
Budgeting considerations