Right now I have a STB that has a QAM decoder in it so I am only paying for basic cable but getting many of the digital cable channels as well as HDTV channels.

Is there any such box for Fios TV that is offered by verizon?

THANKS

Your box isn't "descrambling" anything. Sounds like the many digital channels you are receiving are not being encrypted. There is a FIOS programming and hardware thread, find those to see what other users have found as far as "in the clear" signals.