Phone Pricing

I have FiOS internet and want to add VOIP, but I see and want to make sure that there are two options, $10 monthly for limited 5 cents per call or the $70 unlimited.  What happened to the $15 approximate price for what used to be unlimited calling for Home VOIP?  I want to add phone for less than $20 monthly which ATT is charging, and Optimum usually charges $15 for new user.  Are those the only options I can add.  If there is something less than $20 but not so limited.