I am on my sister/brother-in-law's family share plan.
For my wife and I we pay $40 a month for the phones, and $30 a month for the service. SO a total of $70.
Before we got on that family share plan, my wife and I had our own phone plan, which was:
550 Minutes anytime minutes
unlimited mobile to mobile minutes as long as the other party was on AT&T
Unlimited Nights (after 9pm) minutes
Unlimited Weekend minutes
Roll Over minutes
No text messaging
we both had LG Dumb phones
paid $60 a month.
When we canceled our service, we still had ~3000 roll over minutes available