suggested this on May 16, 2012 16:25
Feature request: Zello for Symbian OS.
Update 3 April 2014: We hear you guys! Thanks for showing your support for Symbian version of Zello. We haven't made this happen because our team hasn't been able to create a great user experience for phones like Symbian.
And we don't want to put out a product that's subpar. Thanks for showing your support. Keep those comments coming.