Can I return my one and only STB and eliminate rental fee while maintaining FIOS TV service?

[m289]

Most of the channels I'm interested in have Roku apps, so I was thinking I might return Verizon's STB and eliminate the monthly rental fee. It's the only STB I have and I was wondering if the standard FIOS contract requires customer to keep and pay rental fee for at least one STB.

I still have over a year on my FIOS contract, and I do want to maintain FIOS TV service (which I use to access my desired channels via Roku).

[jonjones1]

I believe you can use a cable card and eliminate the set top box.

if you are under contract Verizon may mess with your services and may increase pricing etc. I believe there is a fee for cable card use. 

[CRobGauth]

Unfortunately, Verizon only offers the local channels without paying for either a STB or cable card.
Cable cards are cheaper. Not sure what happens if you rent the cable card but do not activate it in a device.